Year Date Event 1903 27 June Ban Khuen-Héderváry resigned to become the Hungarian Prime Minister. Teodor Pejačević was appointed Ban . 1907 26 June Aleksandar Rakodczay became Ban . 1908 8 January Pavao Rauch was appointed Ban . 27 February Croatian parliamentary election, 1908 : The first day of balloting was held.28 February Croatian parliamentary election, 1908 : The second day of balloting was held. The Croat-Serb Coalition won a majority of seats in the Sabor .12 March Rauch dissolved the Sabor . 1910 5 February Rauch was dismissed and replaced as Ban by Nikola Tomašić . 28 October Croatian parliamentary election, 1910 : The Croat-Serb Coalition won a plurality of seats in the Sabor .1912 19 January Slavko Cuvaj was appointed Ban . 1913 21 July Ivan Škrlec was appointed Ban . 16 December Croatian parliamentary election, 1913 : The first day of balloting was held.17 December Croatian parliamentary election, 1913 : The second day of balloting was held. The Croat-Serb Coalition won a majority of seats in the Sabor .1914 28 June Assassination of Archduke Franz Ferdinand of Austria : Archduke Franz Ferdinand of Austria was assassinated by Gavrilo Princip of the Bosnian separatist group Young Bosnia .[ citation needed ] 23 July July Crisis : Austria-Hungary issued an ultimatum to Serbia , demanding, among other things, the right to participate in the investigation into the assassination of Franz Ferdinand , which Serbia refused.[ citation needed ] 28 July World War I : Austria-Hungary declared war on Serbia .30 July World War I : Russia mobilized its army to defend Serbia .1915 Škrlec reconvened the Sabor . 26 April World War I : The secret Treaty of London (1915) was signed, under which Russia , France and the United Kingdom recognized Italian territorial claims (including some in Croatia) in return for Italy's joining the war on the side of the Triple Entente .[ citation needed ] 1916 21 November Franz Joseph I of Austria died. He was succeeded as king by his grandnephew Charles I of Austria . 1917 29 June Skerlecz resigned. Antun Mihalović became Ban . 1918 29 October The Sabor dissolved Croatia's union with Austria-Hungary and incorporated the Kingdom of Dalmatia into the new State of Slovenes, Croats and Serbs. 1 December The State of Slovenes, Croats and Serbs joined with Serbia to form the new Kingdom of Yugoslavia under King Peter I of Serbia . 1919 20 January Mihalović left office. 1920 12 November Yugoslavia signed the Treaty of Rapallo (1920) , acceding to Italian claims on some of its territory. 28 November Kingdom of Serbs, Croats and Slovenes Constitutional Assembly election, 1920 : The Democratic Party , People's Radical Party and Communist Party were the three most successful parties by number of seats received in the Assembly.29 December The government issued a decree banning Communist propaganda and ordering the dissolution of all Communist organizations until approval of the Constitution. 1921 28 June The Vidovdan Constitution , which abolished the traditional divisions of the region in favor of thirty-three oblasts ruled by royal appointees, was approved. 16 August Peter died. He was succeeded as king by his son Alexander I of Yugoslavia . 1923 18 March Kingdom of Serbs, Croats and Slovenes parliamentary election, 1923 : The People's Radical Party won a plurality of seats in Parliament.1925 8 February Kingdom of Serbs, Croats and Slovenes parliamentary election, 1925 : The People's Radical Party won a plurality of seats in Parliament.1927 11 September Kingdom of Serbs, Croats and Slovenes parliamentary election, 1927 : The People's Radical Party won a plurality of seats in Parliament.1928 20 June Puniša Račić of the People's Radical Party shot five members of the Croatian Peasant Party (HSS) during a session of Parliament. Two were killed instantly, and Party leader Stjepan Radić was fatally wounded. 8 August Radić died. 1929 6 January 6 January Dictatorship : Alexander issued a decree dissolving Parliament and abolishing the Constitution .3 October Alexander replaced the thirty-three oblasts with nine banovinas . 1931 3 September 6 January Dictatorship : Alexander issued the 1931 Yugoslav Constitution , ending the dictatorship.1934 9 October Alexander was assassinated by a Bulgarian mercenary, Vlado Chernozemski , with the Internal Macedonian Revolutionary Organization ; Chernozemski had been contracted by the Ustaše , which was formed in 1929. Alexander was succeeded by his eleven-year-old son, Peter , with his cousin, Prince Paul , leading a regency council of three.[ citation needed ] 1935 5 May Yugoslavian parliamentary election, 1935 : The Yugoslav National Party won a majority of seats in Parliament.1938 11 December Yugoslavian parliamentary election, 1938 : The Yugoslav Radical Union won a majority of seats in Parliament.1939 23 August The Cvetković–Maček Agreement was approved, establishing the autonomous Banovina of Croatia with an elected Sabor and a crown-appointed Ban . 26 August Ivan Šubašić was appointed Ban of Croatia. 1941 25 March World War II : Prince Paul signed the Tripartite Pact , pledging support to the Axis Powers .27 March Yugoslav military coup of 27 March 1941 : A military coup overthrew the Regency and declared Peter II to be of age.[ citation needed ] 6 April World War II in Yugoslavia begins 6 April Invasion of Yugoslavia : Germany opened an invasion of Yugoslavia with an air attack on Belgrade .10 April Independent State of Croatia declared by Ante Pavelić of the Ustaše . 13 May Croatia signed a treaty establishing its borders with Germany . 18 May Prince Aimone, Duke of Aosta was crowned King Tomislav II of Croatia by the Italian King Victor Emmanuel III of Italy . 19 May Croatia ceded land, including most of Dalmatia , to Italy by signing the treaty of Rapallo. 7 June Croatia's borders with Serbia were established. 22 June Operation Barbarossa : Germany launched an invasion of the Soviet Union .4 July A call by the Communist Party of Yugoslavia to resist the Ustaše government marked the birth of the Yugoslav Partisans . August Glina massacre : The Ustaše killed several hundred Serb civilians in a church in Glina .27 October Croatia's borders with Montenegro were established. 1942 5 October Operation Alfa : Italian and Chetnik forces attacked the Partisan -held town of Prozor .10 October Operation Alfa : The battle ended in a Partisan defeat.26 November The Anti-Fascist Council of the People's Liberation of Yugoslavia (AVNOJ) was established as the political organization of the Yugoslav Partisans . 1943 15 May Battle of the Sutjeska : Axis troops surrounded the main Partisan force on the east bank of the Sutjeska river in Bosnia .14 June The National Anti-Fascist Council of the People's Liberation of Croatia (ZAVNOH) , composed of Croatian members of the AVNOJ , held its first session and declared Vladimir Nazor President. 16 June Battle of the Sutjeska : The Partisans escaped across the Sutjeska .25 July Italian King Victor Emmanuel III of Italy dismissed his Prime Minister Benito Mussolini . 31 July Tomislav abdicated on the orders of the Italian King Victor Emmanuel III of Italy . 8 September World War II : An armistice between Italy and Allied armed forces was published, voiding Croatia's territorial concessions of 1941 and the Treaty of Rapallo (1920) .15 November Operation Delphin : Croatian forces undertook a campaign to capture several islands in the Adriatic Sea off the cost of central Dalmatia .21 November The second session of the AVNOJ established the National Committee for the Liberation of Yugoslavia , the government-in-waiting of a federal, democratic Yugoslavia under Prime Minister Josip Broz Tito . 1 December Operation Delphin : The operation concluded successfully.1944 9 May The Federal State of Croatia was established at the third session of the ZAVNOH . 13 May The Department for the Protection of the People (OZNA) was established under Aleksandar Ranković . 25 May Raid on Drvar : German paratroopers attacked Partisan headquarters near Drvar . Tito escaped.16 June Tito and Šubašić signed the Treaty of Vis , which provided for a coalition of royalists and Communists in the government of the future Yugoslavia . 1945 30 March Battle on Lijevče field : Croatian and Chetnik forces met at Lijevče .8 April Battle on Lijevče field : The Chetniks surrendered.6 May Pavelić fled the country. 8 May World War II in Yugoslavia formally ends with the German Instrument of Surrender , but fighting continues. 14 May Battle of Poljana : Retreating Axis troops were forced to surrender to the Partisans . 15 May Bleiburg repatriations : After the retreating Axis column is stopped at Bleiburg , Austria , and forced by the British Army to surrender instead to the Yugoslav Partisans, [ 35] the Yugoslav Partisans commit thousands of reprisals against the remnants of the Ustaše and the civilians who fled Croatia alongside them, as well as some Slovene, Serb, and Montenegrin collaborators. 10 June Tito agreed to the separation of Allied and Partisan forces at the Morgan Line . 21 August ZAVNOH declared itself the People's Parliament of Croatia. 25 August The People's Parliament elected Nazor President of Croatia. October The royalists in the Yugoslavian government resigned. 11 November The Communist Party won an overwhelming majority of votes to the Constituent Assembly of Yugoslavia . 29 November The Federal People's Republic of Yugoslavia was declared and King Peter deposed. 1946 31 January The 1946 Yugoslav Constitution came into force. 1947 10 February The Paris Peace Treaties, 1947 were signed, solidifying Yugoslavia's border with Italy and establishing the Free Territory of Trieste , half of which was to be under Yugoslavian military occupation.[ citation needed ] September The Cominform was established. 1948 May Tito–Stalin split : Croatian Communist Party member Andrija Hebrang was arrested after supporting the Soviet Union in a dispute with Yugoslavia .[ citation needed ] 28 June Tito–Stalin split : Yugoslavia was expelled from the Cominform .1949 19 June Nazor died. 1950 26 June Tito announced the introduction of workers' self-management in Yugoslavia . 1953 13 January The 1953 Yugoslav Constitution came into force. December Vladimir Bakarić became President of Croatia. 1963 7 April The 1963 Yugoslav Constitution came into force. 1967 13 March Croatian Spring : The Declaration on the Status and Name of the Croatian Literary Language was published, demanding equal status for the Croatian language .1971 23 November Croatian Spring : A student protest began in Zagreb .December Croatian Spring : Tito forced Chair of the Croatian Communist Party Savka Dabčević-Kučar to resign.1974 21 February The 1974 Yugoslav Constitution came into force, establishing a nine-member Presidency of Yugoslavia of which Tito was president for Life. April Ivo Perišin became President of Croatia. 8 May Perišin was succeeded by a rotating Croatian Presidency under the 1974 Yugoslav Constitution . 1975 10 November The Treaty of Osimo was signed, under which Italy and Yugoslavia were allowed to annex their respective occupation zones in Trieste . 1980 4 May Tito died. He was succeeded as President of the Presidency of Yugoslavia by the Macedonian Lazar Koliševski . 15 May The Yugoslavian Presidency rotated to the Bosnian Cvijetin Mijatović . 1981 15 May The Yugoslavian Presidency rotated to the Slovenian Sergej Kraigher . 1982 15 May The Yugoslavian Presidency rotated to the Serbian Petar Stambolić . 1983 15 May The Yugoslavian Presidency rotated to the Croatian Mika Špiljak . 1984 15 May The Yugoslavian Presidency rotated to the Montenegrin Veselin Đuranović . 1985 15 May The Yugoslavian Presidency rotated to the Vojvodin Radovan Vlajković . 1986 10 May Ante Marković assumed the Presidency of Croatia. 15 May The Yugoslavian Presidency rotated to the Kosovar Sinan Hasani . 1987 15 May The Yugoslavian Presidency rotated to the Macedonian Lazar Mojsov . 1988 15 May The Yugoslavian Presidency rotated to the Bosnian Raif Dizdarević . 1989 15 May The Yugoslavian Presidency rotated to the Slovenian Janez Drnovšek . 1990 23 January A Communist Party Congress ended the party's legal monopoly in Croatia. 22 April Croatian parliamentary election, 1990 : The first round of elections was held.6 May Croatian parliamentary election, 1990 : The second round of elections was held. The Croatian Democratic Union (HDZ) won a majority of seats in all houses of Parliament.15 May The Yugoslavian Presidency rotated to the Serbian Borisav Jović . 30 May The Serb Democratic Party (SDS) quit the Croatian Parliament. 25 July A Serbian Assembly led by the SDS declared the establishment of the Serbian Autonomous Oblast of Kninska Krajina . 17 August Log Revolution : Secessionist Serbs barricaded roads connecting Kninska Krajina to the rest of Croatia.October Kninska Krajina was superseded by the larger Serbian Autonomous Oblast of Krajina . 22 December The current Constitution of Croatia was ratified. Franjo Tuđman of the HDZ was made President of Croatia. 1991 2 March Pakrac clash : Croatian police arrested 180 Serb rebels who had occupied the town of Pakrac .25 March Presidents of Croatia and Serbia partake in the Milošević–Tuđman Karađorđevo meeting 31 March Plitvice Lakes incident : Croatian police entered the Plitvice Lakes National Park to expel the secessionist forces of Krajina . Two combatants were killed.1 April Plitvice Lakes incident : The Yugoslavian army intervened to end the crisis.1 May Two Croatian police officers were taken prisoner by Serb secessionists in Borovo Selo . 2 May The Croatian Parliament voted to hold a referendum on independence from Yugoslavia . Borovo Selo killings : An attempt to free the captives resulted in a firefight between Serb rebels and police. Twelve Croatian policemen killed, with an unknown number of rebel casualties.15 May Serbia blocked the accession of Croatian Stjepan Mesić to the Yugoslavian Presidency. 19 May Croatian independence referendum, 1991 : Croatian independence from Yugoslavia was approved in referendum, with 93% support.25 June The Croatian Parliament declared Croatia independent from Yugoslavia . Serb secessionists declared the Serbian Autonomous Oblast of Eastern Slavonia, Baranja and Western Syrmia . July Battle of Osijek : JNA forces began shelling the town of Osijek .15 July Operation Coast-91 : JNA and SAO Krajina forces attacked the town of Biograd but were rebuffed.August Operation Opera Orientalis : Yugoslavian intelligence bombed Jewish cemeteries in an attempt to turn international opinion against Croatian independence.1 August Dalj massacre : Serb rebels killed twenty-eight police officers and eleven Croat civilians in Dalj .12 August Serb secessionists declared the Serbian Autonomous Oblast of Western Slavonia . 25 August Battle of Vukovar : The Yugoslavian army and Serb militias laid siege to the town of Vukovar .9 September Battle of the Barracks : The Yugoslavian barracks in Sisak surrendered to Croatian forces.16 September Battle of Šibenik (1991) : The Yugoslavian army attacked Croatian forces in Šibenik .22 September Battle of Šibenik (1991) : Yugoslavian forces were made to retreat.1 October Siege of Dubrovnik : Yugoslavian forces surrounded Dubrovnik .6 October Operation Coast-91 : A truce was agreed.7 October Bombing of Banski dvori : The Yugoslavian army bombed the government residence, the Banski dvori in Zagreb .13 October Široka Kula massacre : Serb forces killed thirty-four civilians.16 October Gospić massacre : A three-day massacre began during which Serb forces killed between twenty-three and one hundred civilians.18 October Lovas massacre : Serbs forced a group of Croat civilians to walk across a minefield, killing twenty-one.21 October Baćin massacre : Serb rebel forces killed some fifty-six civilians.31 October Operation Otkos 10 : Croatian forces moved to block a Yugoslavian advance on Zagreb .4 November Operation Otkos 10 : The operation concluded successfully.10 November Erdut massacre : Serb rebels executed the first ten of the thirty-seven Hungarian and Croat civilians they would eventually massacre in Erdut .12 November Saborsko massacre : Serb rebel forces killed twenty-nine civilians in Saborsko .14 November Battle of the Dalmatian channels : A Yugoslavian ship was sunk by the Croatian navy near Split .16 November Battle of the Dalmatian channels : The Yugoslavian blockade of Split was broken.18 November Battle of Vukovar : The last Croatian forces surrendered. Škabrnja massacre : Serb forces took the town of Škabrnja and began a massacre which would eventually claim eighty-six lives. Bosnian War : The Croatian Democratic Union of Bosnia and Herzegovina (HDZBiH) established Croatian Community of Herzeg-Bosnia at municipalities with majority of Croatian people on the territory of Bosnia and Herzegovina .20 November Vukovar massacre : Some 264 civilians, mostly Croats , were murdered by Serb militias near Vukovar .12 December Operation Orkan 91 The Croatian Army began an advance into Krajina . Operation Whirlwind : The Croatian army attempted to cross the Kupa river against Krajina forces.13 December Voćin massacre : A Serb paramilitary group, the White Eagles , killed several dozen people before retreating from Voćin .Operation Whirlwind : The Croatian advance was stopped.16 December Joševica massacre : Serb forces killed twenty-one civilians in Joševica .19 December Krajina declared independence from Croatia, proclaiming itself the Republic of Serbian Krajina. 21 December Bruška massacre : Serb forces killed ten civilians in Bruška .1992 2 January Operation Orkan 91 : A ceasefire was negotiated.Battle of Osijek : A ceasefire was negotiated.26 February Krajina invested SAO Eastern Slavonia, Baranja and Western Syrmia and Western Slavonia . 6 May Bosnian War : The Graz agreement was drafted, delineating the demarcation between Herzeg-Bosnia and the Republika Srpska in Bosnia and Herzegovina .26 May Siege of Dubrovnik : Croatian forces broke the siege.June Operation Vrbas '92 : Military offensive of the Army of Republika Srpska against the HVO and ARBiH in Jajce .14 June Operation Corridor : The Army of Republika Srpska launched an offensive against the joint forces of Bosnia and Herzegovina , Croatia and Herzeg-Bosnia .21 June Miljevci plateau incident : Croatian forces captured some thirty square miles in a surprise attack on Krajina forces.26 June Operation Corridor : The operation ended with the successful linking of the two parts of Republika Srpska .2 August Croatian parliamentary election, 1992 : The HDZ won a majority of seats in the Sabor . Croatian presidential election, 1992 : Tuđman was reelected with 57% of the vote.12 August Hrvoje Šarinić of the HDZ was elected prime minister. 18 October Croat–Bosniak War : First armed clashes between the Croatian Defence Council (HVO) and the Army of the Republic of Bosnia and Herzegovina (ARBiH).27 October Operation Vrbas '92 : The operation concluded with the conquest of Jajce .1993 22 January Operation Maslenica : The Croatian army launched an offensive to reconquer Krajina territory in northern Dalmatia .1 February Operation Maslenica : The Croatian government halted the offensive.September Operation Neretva '93 : ARBiH forces attack the HVO in Herzegovina and central Bosnia .9 September Operation Medak Pocket : Croatian forces launched a southeastward offensive against Krajina towards the village of Medak .17 September Operation Medak Pocket : Croatia negotiated a ceasefire under international pressure.1994 23 February Croat–Bosniak War : The war was effectively ended with a ceasefire.18 March Croat–Bosniak War : The Washington Agreement was signed, establishing the Federation of Bosnia and Herzegovina within Bosnia and Herzegovina .29 November Operation Winter '94 : Croatian forces launched an offensive into western Bosnia and Herzegovina .24 December Operation Winter '94 : The offensive ended to Croatian territorial advantage.1995 1 May Operation Flash : The Croatian Army launched an offensive which would reconquer the territory of the former Western Slavonia in Krajina .2 May Zagreb rocket attacks : A two-day series of rocket attacks by Serb forces on Zagreb began which would kill seven civilians.3 May Operation Flash : The offensive came to a successful conclusion.25 July Operation Summer '95 : Croatian forces launched a northward offensive from Bosnia and Herzegovina against Krajina forces.30 July Operation Summer '95 : The operation ended to Croatian territorial advantage.4 August Operation Storm : One hundred and fifty thousand Croatian soldiers launched an offensive across a three hundred-mile front into Krajina .9 August Operation Storm : The operation concluded with the surrender of Krajina forces at Vojnić .8 September Operation Mistral 2 : Croatian and Bosnia and Herzegovina forces attacked Republika Srpska forces in western Bosnia and Herzegovina.15 September Operation Mistral : The battle ended in a Republika Srpska defeat.29 October Croatian parliamentary election, 1995 : The HDZ won a majority of seats in the Sabor .7 November Zlatko Mateša of the HDZ was elected prime minister. 12 November The Erdut Agreement was signed by representatives of Croatia and Krajina , establishing a Joint Council of Municipalities in Eastern Slavonia, Baranja and Western Syrmia (1995-1998) , which would guarantee Serb rights under the protection of the United Nations Transitional Authority for Eastern Slavonia, Baranja and Western Sirmium (UNTAES) and later under Croatian sovereignty.[ citation needed ] 14 December Bosnian War : The Dayton Agreement was signed, establishing Bosnia and Herzegovina as an indivisible federation, with an alternating presidency, of the Federation of Bosnia and Herzegovina and the Republika Srpska .1996 15 January The UNTAES mission began. 5 September 1996 Ston–Slano earthquake : A strong M w 6.0 earthquake struck north of Dubrovnik. The worst of the damage occurred in the old town of Ston . There were no fatalities, but there was extensive damage to houses and cultural heritage.1997 15 June Croatian presidential election, 1997 : Tuđman was reelected with 61% of the vote.1998 15 January The UNTAES mission ended. 1999 26 November Tuđman was declared incapacitated due to illness. Speaker of the Croatian Parliament Vlatko Pavletić became acting president. 10 December Tuđman died of cancer. 2000 3 January Croatian parliamentary election, 2000 : The Social Democratic Party of Croatia (SDP) won a plurality of seats in the Sabor .24 January Croatian presidential election, 2000 : Mesić , running with the Croatian People's Party – Liberal Democrats (HNS) , and Dražen Budiša of the Croatian Social Liberal Party (HSLS) qualified for the second round.27 January Ivica Račan of the SDP was elected prime minister, with the HSLS joining the SDP in coalition. 2 February Zlatko Tomčić of the HSS was elected Speaker of the Croatian Parliament, replacing Pavletić in that role and as acting president. 7 February Croatian presidential election, 2000 : Mesić won with 56% of the vote.