1920
From top to bottom, left to right: The Prohibition era begins as the Eighteenth Amendment and Volstead Act ban alcohol across the United States, sparking speakeasies and organized crime; the League of Nations is established in Geneva, Switzerland to maintain global peace; the 1920 Summer Olympics are held in Antwerp, Belgium, introducing the Olympic flag and athlete's oath; the Battle of Warsaw turns the Polish–Soviet War in Poland’s favor, repelling the Red Army; the Red Army invasion of Armenia and Red Army invasion of Azerbaijan bring both nations into the Soviet Union; and the Wall Street bombing kills 38 and injures hundreds in New York City’s financial district.
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1920 (MCMXX) was a leap year starting on Thursday of the Gregorian calendar and a leap year starting on Wednesday of the Julian calendar, the 1920th year of the Common Era (CE) and Anno Domini (AD) designations, the 920th year of the 2nd millennium, the 20th year of the 20th century, and the 1st year of the 1920s decade. As of the start of 1920, the Gregorian calendar was 13 days ahead of the Julian calendar, which remained in localized use until 1923.