1921
From top to bottom, left to right: The Tulsa race massacre destroys the prosperous Greenwood District of Tulsa, Oklahoma, killing hundreds and razing thousands of homes and businesses; the Russian famine of 1921–1922 kills an estimated five million in the Russian Soviet Federative Socialist Republic, prompting limited international aid; the Red Army invasion of Georgia brings the Democratic Republic of Georgia under Soviet control; the Anglo-Irish Treaty ends the Irish War of Independence, creating the Irish Free State as a self-governing dominion; the Rif War begins as Berber tribes led by Abd el-Krim resist Spanish colonial rule in northern Morocco; and the Kronstadt rebellion sees Soviet sailors and workers rise against Bolshevik rule before being crushed by the Red Army.
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1921 (MCMXXI) was a common year starting on Saturday of the Gregorian calendar and a common year starting on Friday of the Julian calendar, the 1921st year of the Common Era (CE) and Anno Domini (AD) designations, the 921st year of the 2nd millennium, the 21st year of the 20th century, and the 2nd year of the 1920s decade. As of the start of 1921, the Gregorian calendar was 13 days ahead of the Julian calendar, which remained in localized use until 1923.