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The 20th century began on 1 January 1901 (MCMI), and ended on 31 December 2000 (MM). [1] [2] It was the 10th and last century of the 2nd millennium and was marked by new models of scientific understanding, unprecedented scopes of warfare, new modes of communication that would operate at nearly instant speeds, and new forms of art and entertainment.
35th century BC: 34th century BC: 33rd century BC: 32nd century BC: 31st century BC: 3rd millennium BC · 3000–2001 BC 30th century BC: 29th century BC: 28th century BC: 27th century BC: 26th century BC: 25th century BC: 24th century BC: 23rd century BC: 22nd century BC: 21st century BC: 2nd millennium BC · 2000–1001 BC 20th century BC ...
June 28: Gavrilo Princip assassinates Archduke Franz Ferdinand of Austria in Sarajevo, triggering the start of World War I that day. August 15: Panama Canal opens. August 26 – 30: Battle of Tannenberg. September 1: Martha, last known passenger pigeon, dies. September 3: Benedict XV becomes Pope. September 6 – 12: First Battle of the Marne.
For a timeline of events from 1801 to 1900, see Timeline of the 19th century; For a timeline of events from 1901 to 1945, see Timeline of the 20th century. For 1914–1918, see Timeline of World War I; For 1939–1945 see Timeline of World War II
The celebration of the 20th century’s ending expressed the popular opinion that New Year's Eve 1999 and New Year's Day 2000 marked the turn of the millennium, while strictly speaking the 20th century ended on New Year's Eve 2000 and the 21st century began on New Year's Day 2001.
The 21st century is the current century in the Anno Domini or Common Era, in accordance with the Gregorian calendar. It began on 1 January 2001 , and will end on 31 December 2100 . It is the first century of the 3rd millennium .
The Longplayer composition is set to finish on 31 December 2999, marking the end of the thousand-year piece of music, which began on 1 January 2000. The second millennium celebrations is set to happen also on 31 December 2999, 1000 years after the first , which ocurred on 31 December 1999.
The celebrations were held as marking the end of the 2nd millennium, the 20th century, and the 200th decade, and the start of the 3rd millennium, the 21st century, and the 201st decade (although the start and end points of such periods was then, it continues to be disputed).