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1900 (MCM) was an exceptional century common year starting on Monday of the Gregorian calendar and a leap year starting on Saturday of the Julian calendar, the 1900th year of the Common Era (CE) and Anno Domini (AD) designations, the 900th year of the 2nd millennium, the 100th and last year of the 19th century, and the 1st year of the 1900s decade. As of the start of 1900, the Gregorian calendar was 12days ahead of the Julian calendar, which remained in localized use until 1923.
As of March 1 (O.S. February 17), when the Julian calendar acknowledged a leap day and the Gregorian calendar did not, the Julian calendar fell one day farther behind, bringing the difference to 13 days until February 28 (O.S. February 15), 2100.
The year 1900 was the end of the 19th century and the beginning of the 20th century. Two days into the new year, the U.S. Secretary of State John Hay announced the Open Door Policy regarding China, advocating for equal access for all nations to the Chinese market. The Galveston hurricane would become the deadliest natural disaster in United States history, killing between 6,000 and 12,000 people, mostly in and near Galveston, Texas, as well as leaving 10,000 people homeless, destroying 7,000 buildings of all kinds in Galveston. As of 2025, it remains the fourth deadliest Atlantic hurricane on record. An ongoing Boxer Rebellion in China escalates with multiple attacks by the Boxers on Chinese and European civilians, killing hundreds; the rebellion would progress with the Russian Empire's invasion of Manchuria and the Battle of Peking (1900). During the Scramble for Africa, the Battle of Kousséri would see French forces secure their domination of Chad, which would become a French colony. Britain would annex the South African Republic and the Orange Free State in Southern Africa, becoming the Orange River Colony until 1910.
For Britain, developments such as the Battle of Platrand, Battle of Spion Kop and the Battle of Paardeberg in the Second Boer War highlighted the harsh nature of Boer guerrilla tactics. The British Labour Party was founded in 1900, emerging out of the Labour movement and socialist parties of the 19th century; it would go on to become a major political force in Britain after the First World War. The Federation of Australia is enacted, marking the unification of its colonies into a single country.
Four main scientific discoveries were achieved in the year 1900:
Giacomo Puccini's opera Tosca premiers, one of the most frequently performed operas worldwide, a melodramatic piece set in Rome in June 1800, with the Kingdom of Naples's control of Rome threatened by Napoleon's invasion of Italy. It contains depictions of torture, murder, and suicide, as well as some of Puccini's best-known lyrical arias.
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L. Frank Baum, an American author, publishes The Wonderful Wizard of Oz , a cornerstone of American children's literature, marking the first book of the Oz series.
The U.S. Senate accepts the British-German Treaty of 1899 on January 14. This formally ended U.S. claims to the Samoan Islands. The U.S.-UK Treaty for a Central American Canal would be signed on February 5. While the initial plan for a Nicaraguan canal did not materialize, this treaty laid the groundwork for the construction of the Panama Canal, a project of immense geopolitical and economic importance.
The year 1900 also marked the Year of the Rat on the Chinese calendar.
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