1900
From top to bottom, left to right:
- The Galveston hurricane devastates Texas, killing about 8,000 people;
- The Siege of the International Legations becomes the climax of the Boxer Rebellion;
- The 1900 Summer Olympics are held in Paris;
- The Exposition Universelle showcases innovation in Paris;
- The Russian invasion of Manchuria heightens tensions in East Asia;
- The Thanksgiving Day Disaster kills 23 during San Francisco's Big Game;
- The Zeppelin LZ 1 makes its first flight;
- The Battle of Paardeberg marks a major Second Boer War victory;
- Umberto I of Italy is assassinated.
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1900 (MCM) was a 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 12 days 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.