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Germany resumed unrestricted submarine warfare, which targeted military and civilian ships.
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The Zimmermann Telegram was made public, revealing Germany's proposal to Mexico to join the war against the United States.
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The United States officially declared war on Germany, entering World War I on the side of the Allied Powers.
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The Balfour Declaration was issued, indicating British support for the establishment of a Jewish homeland in Palestine.
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The Bolsheviks, led by Lenin, seized power in Russia, leading to the October Revolution.
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Russia signed an armistice with Germany, halting hostilities on the Eastern Front.
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Kaiser Wilhelm II of Germany abdicated and fled to the Netherlands.
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Emperor Karl of Austria abdicated, marking the end of the Austro-Hungarian Empire.
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The Armistice was signed at 11 a.m., officially ending World War I. The agreement was signed in a railway car in the Compiègne Forest, France.
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Yugoslavia was proclaimed an independent state, forming the Kingdom of Serbs, Croats, and Slovenes.
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The Paris Peace Conference began, setting the stage for the Treaty of Versailles.
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The Treaty of Versailles was signed, officially ending the state of war between Germany and the Allied Powers.
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President Wilson submitted the Treaty of Versailles to the U.S. Senate for ratification.
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The U.S. Senate failed to ratify the Treaty of Versailles, marking a significant moment in post-war U.S. foreign policy.
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The Treaty of Sèvres was signed, marking the end of hostilities with the Ottoman Empire and leading to the division of Ottoman territories.