Declarations of war during World War II

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Animated map of the European theatre of war during WWII

This is a timeline of declarations of war during World War II.

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A declaration of war is a formal act by which one nation goes to war against another. The declaration is usually the act of delivering a performative speech or the presentation of a signed document by an authorized party of a national government in order to create a state of war between two or more sovereign states. The official international protocol for declaring war was defined in The Hague Peace Conference of 1907 (or Hague II). [1] For the diplomatic maneuvering behind these events, which led to hostilities between nations during World War II, see Diplomatic history of World War II.

List of war declarations

Below is a table showing the outbreak of wars between nations which occurred during World War II. Indicated are the dates (during the immediate build-up to, or during the course of, World War II), from which a de facto state of war existed between nations. The table shows both the "Initiator Nation(s)" and the nation at which the aggression was aimed, or "Targeted Nation(s)". Events listed include those in which there were simple diplomatic breaking of relations that did not involve any physical attack, as well as those involving overt declarations or acts of aggression. In rare cases, war between two nations occurred twice, with an intermittent period of peace. The list here does not include peace treaties or periods of any armistice.

Key to type (fourth column):
AAttack without prior, formal declaration of war;
CDeclaration and/or attack without standard, formal procedure, sometimes preceded by a casus belli thus fait accompli ;
UState of war arrived at through use of ultimatum;
WFormal declaration of war made.
Outbreaks of war between nations during World War II
DateInitiator nation(s)Targeted nation(s)TypeNotes/commentsDocument/event
1939-09-01 Flag of Germany (1935-1945).svg Germany Flag of Poland (1928-1980).svg Poland AGerman attack began at 4:44 a.m., Berlin and Warsaw time. [2] [ better source needed ] [3] [4] Germany claimed that the attack was defensive, citing the Gleiwitz incident, which was actually a false flag attack. [5] Invasion
1939-09-01Flag of First Slovak Republic 1939-1945.svg  Slovakia Flag of Poland (1928-1980).svg Poland A Invasion
1939-09-03Flag of the United Kingdom.svg  United Kingdom
Flag of Australia (converted).svg  Australia
Flag of New Zealand.svg  New Zealand
British Raj Red Ensign.svg India
Flag of Southern Rhodesia (1924-1964).svg  Southern Rhodesia
Flag of Tonga.svg Tonga
Flag of Jordan.svg Transjordan
Flag of Germany (1935-1945).svg Germany U [3] [6] At 11:15 a.m. London time, [7] British PM, Neville Chamberlain publicly delivered his Ultimatum Speech. [a] [6] [8] As the Statute of Westminster 1931 was not yet ratified by the parliaments of Australia and New Zealand, the British declaration of war on Germany also applied to those dominions. Tonga was not a British dominion, instead, as part of the British Commonwealth (a protected state of the UK and the British Empire) declared war separately, alongside Britain (since it administers their foreign affairs). [9] British declaration
1939-09-03Flag of France.svg France

Flag of Morocco.svg Morocco
Flag of Tunisia with French canton.svg Tunisia

Flag of Germany (1935-1945).svg Germany UThe French ultimatum to Germany expired a few hours after the British ultimatum, at 17:00. French declaration
1939-09-04 Flag of Nepal (1775-1962).svg Nepal Flag of Germany (1935-1945).svg Germany W

Declaration

1939-09-06Flag of South Africa (1928-1982).svg South Africa Flag of Germany (1935-1945).svg Germany W [3] [6] Declaration
1939-09-10Flag of Bahrain (1932 to 1972).svg Bahrain
Canadian Red Ensign (1921-1957).svg  Canada
Flag of Muscat.svg Oman
Flag of Germany (1935-1945).svg Germany W [3] [6] Canada's declaration several days after that of the United Kingdom is seen as a watershed moment in Canadian home rule and sovereignty.

As for Bahrain, given its status as a protected state of the United Kingdom, it was technically at war as of Britain's declaration, this is an acknowledgement of the declaration of war by Britain (due to coercion by an advisor),

Oman, under British influence, is coerced to participate in the war effort.

Declaration

Declaration

Declaration

1939-09-17Flag of the Soviet Union (1936 - 1955).svg  Soviet Union Flag of Poland (1928-1980).svg Poland A [3] [6] Invasion
1939-11-09 Flag of Kuwait (1921-1940).svg Kuwait Flag of Germany (1935-1945).svg Germany W Declaration
1939-11-30Flag of the Soviet Union (1936 - 1955).svg  Soviet Union Flag of Finland.svg  Finland A [3] [6] Invasion
1940-04-09 Flag of Germany (1935-1945).svg Germany Flag of Denmark.svg  Denmark
Flag of Norway.svg  Norway
A [3] Invasion of Denmark
Invasion of Norway
1940-04-12Flag of the United Kingdom.svg United Kingdom Flag of the Faroe Islands.svg  Faroe Islands A [6] Invasion
1940-05-10 Flag of Germany (1935-1945).svg Germany Flag of Belgium (civil).svg  Belgium
Flag of the Netherlands.svg  Netherlands
A/W [3] [6] Date of the German offensive in the West, W from Belgium and the Netherlands. [10]

Belgium

Netherlands

1940-05-10 Flag of Germany (1935-1945).svg Germany Flag of Luxembourg.svg  Luxembourg A [6] Luxembourg
1940-05-10Flag of the United Kingdom.svg  United Kingdom Flag of Iceland.svg Iceland A Invasion
1940-06-10Flag of Italy (1861-1946) crowned.svg Italy Flag of France.svg France
Flag of the United Kingdom.svg  United Kingdom
W [3] [6] Declaration
1940-06-10Canadian Red Ensign (1921-1957).svg  Canada Flag of Italy (1861-1946) crowned.svg Italy W [3] Declaration
1940-06-11Flag of South Africa (1928-1982).svg South Africa
Flag of Australia (converted).svg  Australia
Flag of New Zealand.svg  New Zealand
Flag of France.svg France
Flag of Italy (1861-1946) crowned.svg Italy W [3]

South African declaration

Australian declaration

New Zealand's declaration

French declaration

1940-07-03Flag of the United Kingdom.svg  United Kingdom Flag of France (1794-1958).svg Vichy France A Vichy France cuts off diplomatic relations with the United Kingdom on 8 July 1940. Attack
1940-09-09Flag of Italy (1861-1946) crowned.svg Italy Flag of Egypt (1922-1958).svg Egypt AEgypt never formally declared war on Italy. Invasion
1940-09-22Merchant flag of Japan (1870).svg  Japan Flag of France (1794-1958).svg Vichy France AJapanese troops occupy French Indochina. Invasion
1940-09-23Flag of Free France (1940-1944).svg Free France
Flag of the United Kingdom.svg  United Kingdom
Flag of Australia (converted).svg  Australia
Flag of France (1794-1958).svg Vichy France A Invasion
1940-10-??Flag of Thailand.svg  Thailand Flag of France (1794-1958).svg Vichy France A Franco-Thai War
1940-10-28Flag of Italy (1861-1946) crowned.svg  Italy Flag of Greece (1822-1978).svg Greece U [6] Italy invades Greece. Invasion
1940-10-27Flag of Free France (1940-1944).svg Free France Flag of France (1794-1958).svg Vichy France A [11] Free French Equatorial Africa invades Vichy French Gabon. Invasion
1940-11-23Flag of Belgium (civil).svg Belgium (in-exile)Flag of Italy (1861-1946) crowned.svg  Italy W [12] Declaration
1941-02-05Flag of Free France (1940-1944).svg Free France Flag of Italy (1861-1946) crowned.svg Italy A Invasion
1941-04-06 Flag of Germany (1935-1945).svg Germany Flag of Greece (1822-1978).svg Greece W [3] [6] Invasion
1941-04-06 Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Flag of Yugoslavia (1918-1943).svg Yugoslavia A [3] [6] Invasion
1941-04-07Flag of Yugoslavia (1918-1943).svg Yugoslavia Flag of Hungary (1915-1918, 1919-1946).svg Hungary A [13] After the German invasion, bombing of Hungarian locations. Invasion
1941-04-14 Flag of Germany (1935-1945).svg Germany Flag of Egypt (1922-1958).svg Egypt AEgypt did not formally declare war until 1945. Invasion
1941-05-02Flag of the United Kingdom.svg United Kingdom Flag of Iraq (1924-1959).svg Iraq A Invasion
1941-06-08Flag of Free France (1940-1944).svg Free France Flag of Germany (1935-1945).svg Germany A[ citation needed ] Invasion
1941-06-22 Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Flag of the Soviet Union (1936 - 1955).svg  Soviet Union W [6] A timed declaration of war was given by Germany at the time of the attack [14] . Invasion
1941-06-22/24Flag of Romania.svg Romania Flag of the Soviet Union (1936 - 1955).svg  Soviet Union AOn June 22, Romanian leader Ion Antonescu declared a "holy war" to reclaim ancestral lands and against Bolshevism in an appeal to the nation. [15] The Romanian army began limited military operations. On June 24, Romania officially declared war on the Soviet Union. [15]
1941-06-22 Flag of the Tuvan People's Republic (1941-1943).svg
Tuva
Flag of Germany (1935-1945).svg Germany WTuva was a client state of the Soviet Union. Part of the USSR from 1944.
1941-06-24Flag of Bulgaria.svg Bulgaria Flag of Greece (1822-1978).svg Greece
Flag of Yugoslavia (1918-1943).svg Yugoslavia
A [6] Bulgaria declares war on Greece and Yugoslavia.
1941-06-25Flag of Finland.svg  Finland Flag of the Soviet Union (1936 - 1955).svg  Soviet Union WAfter the bombing of several Finnish locations, Finland recognized a state of war with the Soviet Union; third war between these nations. Continuation War
1941-06-27Flag of Hungary (1915-1918, 1919-1946).svg Hungary Flag of the Soviet Union (1936 - 1955).svg  Soviet Union C [13] After the bombing of several Hungarian locations, the Hungarian military concluded a Soviet attack, the Government had decided the two countries were already belligerent, without the consent of the Parliament, in absence of the Regent. Invasion
1941-08-25Flag of the Soviet Union (1936 - 1955).svg  Soviet Union
Flag of the United Kingdom.svg  United Kingdom
Flag of Australia (converted).svg  Australia
State Flag of Iran (1925).svg Iran A Invasion
1941-12-05Flag of the United Kingdom.svg  United Kingdom
British Raj Red Ensign.svg  India
Flag of Finland.svg  Finland
Flag of Romania.svg Romania
Flag of Hungary (1915-1918, 1919-1946).svg Hungary
W [16] Declaration
1941-12-06Flag of Finland.svg  Finland
Flag of Romania.svg Romania
Flag of the United Kingdom.svg  United Kingdom W [6] Declaration
1941-12-07Flag of the United Kingdom.svg  United Kingdom Flag of Hungary (1915-1918, 1919-1946).svg Hungary W [17] UK declaration of war from 1941-12-05 entered into force on 1941-12-07 1 minute after midnight. Declaration
1941-12-07Merchant flag of Japan (1870).svg  Japan Flag of the United States (1912-1959).svg  United States
Flag of the United Kingdom.svg  United Kingdom
Flag of Thailand.svg  Thailand
AA formal message breaking off diplomatic talks was sent before but arrived after the attacks began, but this was not a declaration of war. [18] See Attack on Pearl Harbor § Japanese declaration of war.

Declaration published after:

1941-12-07Canadian Red Ensign (1921-1957).svg  Canada
Flag of Australia (converted).svg  Australia
Flag of New Zealand.svg  New Zealand
Flag of Finland.svg  Finland
Flag of Romania.svg Romania

Flag of Hungary (1915-1918, 1919-1946).svg Hungary

W [6] Declaration
1941-12-07Canadian Red Ensign (1921-1957).svg  Canada
Flag of Panama.svg  Panama
Flag of Yugoslavia (1918-1943).svg Yugoslavia (in-exile)
Merchant flag of Japan (1870).svg  Japan W [6] Declaration
1941-12-08Flag of the United Kingdom.svg  United Kingdom
Flag of the United States (1912-1959).svg  United States
Canadian Red Ensign (1921-1957).svg  Canada
Flag of Australia (converted).svg  Australia
Flag of Costa Rica (state).svg  Costa Rica
Flag of the Dominican Republic.svg  Dominican Republic
Flag of El Salvador.svg  El Salvador
Flag of Free France (1940-1944).svg Free France

Flag of Greece (1822-1978).svg Greece (in-exile)
Flag of Haiti (1820-1849, 1859-1964).svg Haiti
Flag of Honduras (1898-1949).svg  Honduras
Flag of the Netherlands.svg Netherlands (in-exile)
Flag of New Zealand.svg  New Zealand
Flag of Nicaragua.svg  Nicaragua
Flag of the Philippines (1946-1998).svg  Philippines
Flag of Tonga.svg Tonga [9]

Merchant flag of Japan (1870).svg  Japan W [6] After the attack on Pearl Harbor, many countries declared a formal state of war on Japan.

British declaration
United States declaration
Canadian declaration
Australian declaration
Costa Rican declaration
Dominican Republic's declaration
Salvadoran declaration
Haitian declaration
Honduran declaration
Dutch declaration
New Zealand's declaration
Nicaraguan declaration
Philippine declaration
Tongan declaration

1941-12-08Flag of South Africa (1928-1982).svg South Africa Merchant flag of Japan (1870).svg  Japan
Flag of Finland.svg  Finland
Flag of Romania.svg Romania
Flag of Hungary (1915-1918, 1919-1946).svg Hungary
W [6] Declaration
1941-12-08 Flag of the People's Republic of Mongolia (1940-1945).svg Mongolia Flag of Germany (1935-1945).svg Germany W[ citation needed ]

Declaration

1941-12-08 Flag of Manchukuo.svg Manchukuo Flag of the United States (1912-1959).svg  United States W [6]

Declaration

1941-12-08Merchant flag of Japan (1870).svg  Japan Flag of the United Kingdom.svg British Malaya A Invasion of Malaya

Attack on Singapore

1941-12-09 Flag of Cuba (sky blue).svg Cuba
Flag of Guatemala.svg  Guatemala
Merchant flag of Japan (1870).svg  Japan W [6] Cuban declaration
Guatemalan declaration
1941-12-09Flag of the Republic of China.svg  China Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Merchant flag of Japan (1870).svg  Japan
W [6] China and Japan had been at undeclared war since 1937. Second Sino-Japanese war

Declaration

1941-12-10Flag of the Provisional Government of the Republic of Korea.svg  Korea (government in exile) [19] Merchant flag of Japan (1870).svg  Japan WMany Korean armies such as the Korean Liberation Army had already been fighting Japan in the Second Sino-Japanese war. although a formal declaration was not made until the attack on Pearl Harbor. Declaration
1941-12-11 Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Flag of the United States (1912-1959).svg  United States W [3] [6]

German declaration

Italian declaration

1941-12-11Flag of the United States (1912-1959).svg  United States
Flag of Cuba (sky blue).svg Cuba
Flag of Costa Rica (state).svg  Costa Rica
Flag of the Dominican Republic.svg  Dominican Republic
Flag of Guatemala.svg  Guatemala
Flag of Nicaragua.svg  Nicaragua
Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
W [6] U.S. declaration of war on Germany

U.S. declaration of war on Italy

1941-12-11Flag of the Netherlands.svg Netherlands (in-exile)Flag of Italy (1861-1946) crowned.svg Italy W [6] Declaration
1941-12-11Flag of Poland (1928-1980).svg Poland (in-exile)Merchant flag of Japan (1870).svg  Japan W [3] Japan rejected the declaration of war. Prime Minister Hideki Tōjō's answer was: "We don't accept the Polish declaration of war. The Poles, fighting for their freedom, declared war under the British pressure"[ citation needed ]. [b]
1941-12-12Flag of Romania.svg Romania
Flag of Bulgaria.svg Bulgaria
Flag of First Slovak Republic 1939-1945.svg  Slovakia
Flag of the United States (1912-1959).svg  United States
Flag of the United Kingdom.svg  United Kingdom
W [6]

Romanian declaration

Bulgarian declaration

1941-12-12 Flag of Haiti (1820-1849, 1859-1964).svg Haiti
Flag of El Salvador.svg  El Salvador
Flag of Panama.svg  Panama
Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
W [6] Declaration
1941-12-12Flag of Australia (converted).svg  Australia
Flag of the Netherlands.svg  Netherlands
Flag of Portugal.svg Portugal A Portugal maintained neutrality throughout World War II.

Invasion

1941-12-13Flag of the United Kingdom.svg  United Kingdom
Flag of New Zealand.svg  New Zealand
Flag of South Africa (1928-1982).svg South Africa
Flag of Bulgaria.svg Bulgaria W [6]

British declaration

New Zealand's declaration

South African declaration

1941-12-13Flag of Honduras (1898-1949).svg  Honduras Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
W [6] Declaration
1941-12-13Flag of Italy (1861-1946) crowned.svg Italy Flag of Cuba (sky blue).svg Cuba
Flag of Guatemala.svg  Guatemala
W [6] Declaration
1941-12-14Flag of Independent State of Croatia.svg Independent State of Croatia Flag of the United States (1912-1959).svg  United States
Flag of the United Kingdom.svg  United Kingdom
W [6] Declaration
1941-12-15Flag of Hungary (1915-1918, 1919-1946).svg Hungary Flag of the United States (1912-1959).svg  United States C [20] The Prime Minister informed the U.S. ambassador without approval of the Parliament and the Regent, but initially denied it would mean "war" in fact, however two days later he declared it means the two countries became belligerent. As the ambassador refused to accept the verbal form of this act, the next day the Prime Minister in written reinforced it. Declaration
1941-12-16Flag of the Czech Republic.svg Czechoslovakia (in-exile) Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Flag of Finland.svg  Finland
Flag of Romania.svg Romania
Flag of Hungary (1915-1918, 1919-1946).svg Hungary
Merchant flag of Japan (1870).svg Japan
Flag of Bulgaria.svg Bulgaria
Flag of Independent State of Croatia.svg Independent State of Croatia
Flag of First Slovak Republic 1939-1945.svg  Slovakia
W [6] Czechoslovakia declares war on all countries at war with the United States of America, Great Britain and the Union of Soviet Socialist Republics. Declaration
1941-12-16Merchant flag of Japan (1870).svg Japan Flag of the Kingdom of Sarawak (1870).svg Sarawak
Flag of North Borneo (1902-1946).svg North Borneo
Flag of Brunei 1906-1959.svg Brunei
A Invasion
1941-12-17Flag of Albania (1939-1943).svg Albania Flag of the United States (1912-1959).svg  United States W Declaration
1941-12-19Flag of Nicaragua.svg  Nicaragua Flag of Romania.svg Romania
Flag of Hungary (1915-1918, 1919-1946).svg Hungary
Flag of Bulgaria.svg Bulgaria
W [6] Declaration
1941-12-19Flag of Romania.svg Romania Flag of Nicaragua.svg  Nicaragua W [21] Out of the Axis countries only Romania reciprocated, declaring war on Nicaragua on the same day.Declaration
1941-12-20Flag of Belgium (civil).svg Belgium (in-exile)Merchant flag of Japan (1870).svg  Japan W Declaration
1941-12-24 Flag of Haiti (1820-1849, 1859-1964).svg Haiti Flag of Romania.svg Romania
Flag of Hungary (1915-1918, 1919-1946).svg Hungary
Flag of Bulgaria.svg Bulgaria
W [6] Declaration
1941-12-24Flag of Romania.svg Romania Flag of Haiti (1820-1849, 1859-1964).svg Haiti W [22] Out of the Axis countries only Romania reciprocated, declaring war on Haiti on the same day.Declaration
1941-12-25Flag of Greece (1822-1978).svg Greece (in-exile)

Merchant flag of Japan (1870).svg  Japan

WDeclaration
1942-01-01 United Nations Axis Powers WDeclared during Arcadia Conference. Declaration
1942-01-06Flag of Australia (converted).svg  Australia Flag of Bulgaria.svg Bulgaria W Declaration
1942-01-25Flag of Thailand.svg  Thailand Flag of the United Kingdom.svg  United Kingdom
Flag of the United States (1912-1959).svg  United States
A Declaration
1942-01-25Flag of the United Kingdom.svg  United Kingdom
Flag of New Zealand.svg  New Zealand
Flag of South Africa (1928-1982).svg South Africa
Flag of Thailand.svg  Thailand W

British declaration

New Zealand's declaration

South African declaration

1942-02-19Merchant flag of Japan (1870).svg  Japan Flag of Portugal.svg Portugal A Portugal maintained neutrality throughout World War II. Invasion
1942-03-02Flag of Australia (converted).svg  Australia Flag of Thailand.svg  Thailand W [6]

Declaration

1942-05-05Flag of South Africa (1928-1982).svg South Africa
Flag of the Netherlands.svg Netherlands (in-exile)
Flag of Poland (1928-1980).svg Poland
Flag of France (1794-1958).svg Vichy France A Invasion
1942-05-05Flag of the United Kingdom.svg United Kingdom
Flag of Northern Rhodesia (1939-1964).svg Northern Rhodesia
Flag of Southern Rhodesia (1924-1964).svg Southern Rhodesia
Flag of South Africa (1928-1982).svg South Africa
Flag of Tanganyika (1923-1961).svg Tanganyika
Flag of the Congo Free State.svg Belgian Congo
Flag of France (1794-1958).svg Vichy France
Merchant flag of Japan (1870).svg  Japan
A Invasion
1942-05-22Flag of Mexico (1934-1968).svg  Mexico Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Merchant flag of Japan (1870).svg  Japan
W [6] Declaration
1942-06-05Flag of the United States (1912-1959).svg  United States Flag of Hungary (1915-1918, 1919-1946).svg Hungary
Flag of Romania.svg Romania
Flag of Bulgaria.svg Bulgaria
W [13] United States Declaration of War upon Hungary
United States Declaration of War upon Romania
United States declaration of war upon Bulgaria
1942-06-13 Iroquois Confederacy Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Merchant flag of Japan (1870).svg  Japan
WHaving never made peace with Germany from the First World War, Haudenosaunee became the only Native American state to officially declare war on the Axis powers separately from the United States (other Native American nations issued declarations or declared war de facto alongside the United States as their tribal citizens enlisted in the Armed Forces [23] ).
1942-08-22 Flag of Brazil (1889-1960).svg Brazil Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
W Declaration
1942-11-08Flag of the United States (1912-1959).svg United States
Canadian Red Ensign (1921-1957).svg Canada
Flag of France (1794-1958).svg Vichy France A Invasion
1942-11-10 Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Flag of France (1794-1958).svg Vichy France A Invasion
1942-11-12 Flag of Germany (1935-1945).svg Germany Flag of Tunisia with French canton.svg Tunisia AGerman invasion via airlifting several divisions in reaction to Operation Torch, swiftly occupying Tunis and the eastern part of the country, and capturing the western portions after French Tunisian resistance before the allies reached the Tunisian border. In the resulting Tunisian campaign, the Allies finally defeated the Axis forces in Africa.Invasion
1942-12-14 Flag of Ethiopia (1897-1936; 1941-1974).svg Ethiopia Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Merchant flag of Japan (1870).svg  Japan
WOn 3 October 1935, Italy invaded Ethiopia without a formal declaration of war. In response to the Italian invasion, Ethiopia declared war on Italy. Most of Ethiopia was occupied by Italy in 1936, however parts of Ethiopia remained under the control of the Ethiopian Patriots Movement, which begun its guerrilla war against the occupying Italian forces the day Addis Ababa fell in May 1936. In May 1941, Addis Ababa was liberated by the Gideon Force, restoring sovereignty to Ethiopia. Second Italo-Ethiopian War

Declaration

1943-01-09Flag of the Republic of China-Nanjing (Peace, Anti-Communism, National Construction).svg Reorganized National Government of China Flag of the United States (1912-1959).svg  United States
Flag of the United Kingdom.svg  United Kingdom
W [6] Declaration
1943-01-17Flag of Iraq (1924-1959).svg Iraq Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Merchant flag of Japan (1870).svg  Japan
W [6] Declaration
1943-01-20Flag of Chile.svg  Chile Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
W Chile cut off diplomatic relations with the German Reich and Fascist Italy on 20 January 1943. Declaration
1943-04-07Flag of Bolivia.svg  Bolivia Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Merchant flag of Japan (1870).svg  Japan
Other axis nations
WBolivia officially joined the Allies on 7 April 1943. Shortly after war was declared, the President, Enrique Peñaranda, was overthrown in a coup. Bolivian mines supplied needed tin to the Allies, but no troops or warplanes were sent overseas. Bolivians remained confident their geographic isolation would protect them from the war. Declaration
1943-08-01Flag of Burma 1943.svg State of Burma Flag of the United States (1912-1959).svg  United States
Flag of the United Kingdom.svg  United Kingdom
W [6] Declaration
1943-09-08 Flag of Germany (1935-1945).svg Germany Flag of Italy (1861-1946) crowned.svg Italy
Flag of Albania (1939-1943).svg Albania
AAfter Italy's capitulation to the Allied powers, Germany swiftly invaded both Italy and Italian-controlled territories (such as Albania, an Italian satellite state) to preempt a possible Allied intervention. Operation Achse, German occupation of Albania
1943-09-09State Flag of Iran (1925).svg Iran Flag of Germany (1935-1945).svg Germany W Declaration
1943-10-13Flag of Italy (1861-1946) crowned.svg Italy Flag of Germany (1935-1945).svg Germany W [3] Italy had changed sides after the fall of Mussolini. The Declaration of War was given by Pietro Badoglio to the German ambassador in Madrid. [3] Declaration
1943-11-26Flag of Colombia.svg Colombia Flag of Germany (1935-1945).svg Germany WSee Colombia during World War II. Declaration
1944-01-17Flag of Free France (1940-1944).svg Free France Flag of Italy.svg Italian Social Republic A Invasion
1944-01-27Flag of Liberia.svg Liberia Flag of Germany (1935-1945).svg Germany
Merchant flag of Japan (1870).svg  Japan
W Declaration
1944-06-06Flag of France.svg France Flag of Germany (1935-1945).svg Germany A Invasion
1944-07-25Flag of France.svg France Merchant flag of Japan (1870).svg  Japan A Invasion
1944-08-25Flag of Romania.svg Romania Flag of Germany (1935-1945).svg Germany W [6] Romania switched sides. Declaration
1944-09-05Flag of the Soviet Union (1936 - 1955).svg  Soviet Union Flag of Bulgaria.svg Bulgaria W Declaration
1944-09-07Flag of Hungary (1915-1918, 1919-1946).svg Hungary Flag of Romania.svg Romania W [6] Declaration
1944-09-07Flag of Romania.svg Romania Flag of Hungary (1915-1918, 1919-1946).svg Hungary W [6] Declaration
1944-09-08Flag of Bulgaria.svg Bulgaria Flag of Germany (1935-1945).svg Germany W [ citation needed ]Bulgaria switched sides. Declaration
1944-09-15 Flag of Germany (1935-1945).svg Germany Flag of Finland.svg  Finland A Lapland War
1944-09-23Flag of the Philippines (1943-1945).svg  Second Philippine Republic Flag of the United States (1912-1959).svg  United States
Flag of the United Kingdom.svg  United Kingdom
W [24] Declaration
1944-12-28Flag of Hungary (1915-1918, 1919-1946).svg  Hungary Flag of Germany (1935-1945).svg  Germany W [25] The Provisional National Government  [ ru ], which had been established under Soviet protection in the city of Debrecen, declared war on Germany. The German-backed Arrow Cross regime was still at war with the Soviet Union and its troops were still in action. In January 1945, the Provisional National Government signed an armistice with the Allies, where it confirmed the declaration of war on Germany and obliged itself to form military forces loyal to the Allies. [26] Declaration
1945-02-02Flag of Ecuador (1900-2009).svg  Ecuador Flag of Germany (1935-1945).svg Germany
Merchant flag of Japan (1870).svg  Japan
W Declaration
1945-02-07Flag of Paraguay (1842-1954).svg  Paraguay Flag of Germany (1935-1945).svg Germany
Merchant flag of Japan (1870).svg  Japan
W Declaration
1945-02-12Flag of Peru (1884-1950).svg  Peru Flag of Germany (1935-1945).svg Germany
Merchant flag of Japan (1870).svg  Japan
W [6] Declaration
1945-02-15 Flag of Venezuela (1930-1954).svg Venezuela
Flag of Uruguay.svg  Uruguay
Flag of Germany (1935-1945).svg Germany
Merchant flag of Japan (1870).svg  Japan
W

Declaration

Declaration

1945-02-23Flag of Turkey.svg  Turkey Flag of Germany (1935-1945).svg Germany
Merchant flag of Japan (1870).svg  Japan
W Declaration
1945-02-24Flag of Egypt (1922-1958).svg Egypt Flag of Germany (1935-1945).svg Germany
Merchant flag of Japan (1870).svg  Japan
W Declaration
1945-02-26Flag of Syria (1932-1958; 1961-1963).svg Syria
Flag of Lebanon.svg  Lebanon
Flag of Germany (1935-1945).svg Germany
Merchant flag of Japan (1870).svg  Japan
W Declaration
1945-02-28Flag of Saudi Arabia (1938-1973).svg  Saudi Arabia Flag of Germany (1935-1945).svg Germany W Declaration
1945-03-01Flag of Saudi Arabia (1938-1973).svg  Saudi Arabia Merchant flag of Japan (1870).svg  Japan W [6] Declaration
1945-03-01State Flag of Iran (1925).svg Iran Merchant flag of Japan (1870).svg  Japan W [6] Iran declared war on Japan retroactive to the previous day (Feb. 28, 1945). Declaration
1945-03-03Flag of Finland.svg  Finland Flag of Germany (1935-1945).svg Germany WFinland declared war on Germany retroactive to Sept. 15, 1944 following terms of 1944 Moscow Armistice. Lapland War
1945-03-07Flag of Romania.svg Romania Merchant flag of Japan (1870).svg  Japan W [6] Declaration
1945-03-27Flag of Argentina.svg  Argentina Flag of Germany (1935-1945).svg Germany
Merchant flag of Japan (1870).svg  Japan
W

Declaration

1945-04-11Flag of Chile.svg  Chile Merchant flag of Japan (1870).svg  Japan W Declaration
1945-06-07 Flag of Brazil (1889-1960).svg Brazil Merchant flag of Japan (1870).svg  Japan W [6] Declaration
1945-07-09 Flag of Norway.svg Norway (in-exile) Merchant flag of Japan (1870).svg  Japan WNorwegian government-in-exile announced that it had declared war on Japan on December 7, 1941. Declaration [27]
1945-07-14Flag of Italy (1861-1946) crowned.svg Italy Merchant flag of Japan (1870).svg  Japan W Declaration
1945-08-08Flag of the Soviet Union (1936 - 1955).svg  Soviet Union Merchant flag of Japan (1870).svg  Japan W [3] Last outbreak of war of the Second World War. Soviet–Japanese War
1945-08-10 Flag of the People's Republic of Mongolia (1945-1992).svg Mongolia Merchant flag of Japan (1870).svg  Japan W [28] W (de jure) A (de facto 1945-08-09) War declared 24 hours after crossing the border with Soviet troops.

Soviet Invasion of Manchuria
Mongolia in World War II

See also

Notes

  1. Included in the speech: "...This morning, the British Ambassador in Berlin handed the German Government a final note, stating that unless we heard from them by 11 O'clock that they were prepared at once to withdraw their troops from Poland a state of war would exist between us. I have to tell you now that no such undertaking has been received and that consequently this country is at war with Germany..."
  2. The state of war was not recognized by, or formally ended until 1957, when Japan concluded a separate peace treaty in order to establish diplomatic relations with the Polish People's Republic. The Polish government-in-exile never recognized the peace treaty and remained in a technical state of war with Japan until it disbanded in 1991, following the fall of communism in Poland.

References

  1. On the Opening of Hostilities; 1907; Yale Law School Library; retrieved March 2014.
  2. "Germans invade Poland". History.com. Retrieved 1 December 2019.
  3. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 "2194 Days of War"; (1977); Salmaggi, C. & Pallasvini, A.; ISBN   91-582-0426-1; per tables included. [Italian; American]
  4. "BBC ON THIS DAY | 1". news.bbc.co.uk.
  5. Polak-Springer, Peter (2015). Recovered Territory: A German-Polish Conflict over Land and Culture, 1919-1989. Berghahn Books. p. 1. ISBN   978-1-78238-888-3.
  6. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Doody, Richard, "Chronology of World War II Diplomacy 1939 - 1945", World at War, archived from the original on May 5, 2016
  7. Mann, Andrea. "September 3, 1939: Britain declares war on Germany after Hitler's troops invade Poland". BT.com. Retrieved 1 December 2019.
  8. 1939: Britain and France declare war on Germany, BBC
  9. 1 2 "The United States Invasion of Tonga In 1942". Archived from the original on 25 February 2005. Retrieved 23 July 2021.
  10. Swedish Encyklopedia; "Bonniers Lexikon" (Vol. 1); (c.1960s); table in article by Andra Världskriget: The Second World War; Pp. 461-462.
  11. Kennedy, David M. The Library of Congress World War II Companion p. 466
  12. Veranneman, Jean-Michel (30 September 2014). Belgium in WWII. Pen and Sword. ISBN   9781783376070.
  13. 1 2 3 "Táblázat az egyes államok hadiállapotba kerüléséről". arcanum.hu. Arcanum Adatbázis Kft.
  14. "The Rise and Fall of the Third Reich"; Shirer, William L
  15. 1 2 Boog et al. 1998, p. 408.
  16. "BBC - WW2 People's War - Timeline". www.bbc.co.uk.
  17. "Hadiállapot Magyarország és Nagy-Britannia között". arcanum.hu. Arcanum Adatbázis Kft.
  18. Prange, Goldstein & Dillon 1981 , p. 485. "[The] fourteenth part was not a formal declaration of war. It did not even rupture diplomatic relations. It merely broke off the discussions."
  19. "백범김구선생기념사업협회". kimkoo.or.kr. Retrieved 2025-03-15.
  20. Draveczki-Ury, Ádám (11 December 2011). "Hetven éve történt: hadüzenet az Egyesült Államoknak". honvedelem.hu. Honvédelmi Minisztérium. Archived from the original on 29 September 2019. Retrieved 23 April 2020.
  21. Dr Erik Goldstein, Routledge, 2005, Wars and Peace Treaties: 1816 to 1991, p. 218
  22. Dr Erik Goldstein, Routledge, 2005, Wars and Peace Treaties: 1816 to 1991, p. 217
  23. Morgan, Thomas D. (Fall 1995). "Native Americans in World War II" (PDF). Army History: The Professional Bulletin of Army History (35): 22–27. Retrieved 2025-03-13 via history.army.mil.
  24. "1. United States/Philippines (1898-1946)".
  25. "Az új államiság kiépítése Magyarországon | Magyarok a II. világháborúban | Kézikönyvtár". www.arcanum.hu. Retrieved 2021-04-01.
  26. Executive Agreement Series. Department of State. 1945.
  27. "Norway Declares War on Japan". Canberra Times (Act : 1926 - 1995). 9 July 1945. p. 1.
  28. Christopher P. Atwood (1999), "Sino-Soviet Diplomacy and the Second Partition of Mongolia, 1945–1946", Mongolia in the Twentieth Century: Landlocked Cosmopolitan, Bruce A. Elleman and Stephen Kotkin, eds. (Armonk, NY: M. E. Sharpe), 147.

Bibliography