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League of Nations is established after the Treaty of Versailles to promote peace.
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19th Amendment to the U.S. Constitution is ratified, granting women the right to vote.
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Warren G. Harding wins the U.S. presidential election, promising a "return to normalcy."
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Washington Naval Conference begins, leading to several disarmament treaties.
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Benito Mussolini marches on Rome, marking the beginning of Fascist rule in Italy.
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The Irish Free State was established, gaining independence from the United Kingdom.
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President Warren G. Harding dies, and Calvin Coolidge becomes the 30th U.S. President
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Beer Hall Putsch in Germany—Adolf Hitler's failed attempt to overthrow the Weimar government.
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Vladimir Lenin dies, leading to Joseph Stalin's rise in the Soviet Union.
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Reza Khan seizes power in Iran, becoming Shah and modernizing the country.
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Locarno Treaties are signed, securing post-World War I borders in Europe.
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Birth of Queen Elizabeth II (then Princess Elizabeth).
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General Strike in the United Kingdom involves industrial workers protesting for better wages.
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Charles Lindbergh completes the first solo nonstop transatlantic flight from New York to Paris.
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Alexander Fleming discovers penicillin, revolutionizing medical science.
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Herbert Hoover is elected U.S. President.
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The Lateran Treaty is signed, establishing Vatican City as an independent state.
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Black Thursday occurs, marking the beginning of the Wall Street Crash and the Great Depression.