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Nationalists in China ousted the last Qing emperor, Puyi, in 1911.
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In 1914, after a Serbian killed Archduke Franz Ferdinand, Austria declared war on Serbia.
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The United States was pushed into entering World War 1 in 1917.
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In 1918, after the Allies defeated the Central Powers in World War 1, an armistice was signed.
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Outraged at the way that Britain was taking advantage of India, Ghandi lead a campaign of civil disobedience in 1920.
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Mustafa Kemal - often referred to as "Ataturk" or "father of the Turks" - transformed Turkey into a republic in 1923.
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Mao Zedong, who would later become a Chinese dictator, lead the Long March in 1934.