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Archduke Franz Ferdinand is Murdered
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Austria-Hungary declares war on Serbia
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Germany declares war on Russia, France and Belgium. Britain declares war on Germany. Austria-Hungary declares war on Russia. France and Britain declare war on Austria-Hungary. Japan declares war on Germany. Austria-Hungary declares war on Belgium.
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Germany invades Belgium, but is stopped at the First Battle of the Marne. The Schlieffen Plan fails.
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First Battle of Ypres: Attempting to outflank each other, Allied and German troops were unable to win a decisive victory, leading to the onset of trench warfare.
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Britain and France declare war on the Ottoman Empire.
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Germany initiates a policy of unrestricted submarine warfare, whereby all merchant ships, including those of neutral countries, would be subject to attack.
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Second Battle of Ypres: Germans launch the first successful gas attack in history. By the end of the war, both Allied and Central Powers will have used chemical weapons.
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British and French troops, including Australians and New Zealanders (ANZAC) land on the Gallipoli peninsula in the Ottoman Empire.
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German U-boat torpedoes the Lusitania, a British passenger liner. 128 Americans are killed.
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Period: to
Timespan
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After Germany resumes its campaign of unrestricted submarine warfare, the U.S. severs diplomatic relations with Germany.
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British intelligence intercepts the Zimmermann Telegram, a secret communication from Germany proposing an alliance with Mexico should the United States enter World War I.
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U.S. President Woodrow Wilson delivers a war message to Congress, famously stating that “the world must be made safe for democracy.”
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Following passage of the war resolution by the Senate and House, the United States is officially at war with the German Empire.
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The U.S. Congress authorizes the Selective Service Act, initiating the first military draft since the Civil War.
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U.S. President Woodrow Wilson outlines his Fourteen Points for peace.
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Having been given 72 hours to agree to Allied demands, Germany signs the armistice. Supreme Allied Commander Marshal Ferdinand Foch orders that all hostilities on the Western Front cease at 11 a.m. Paris time.
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Germany is forced to sign the Treaty of Versailles. Germany cedes Alsace-Lorraine to France, recognizes Belgian sovereignty, disarms and agrees to pay war reparations. U.S. Senate refuses to ratify the Treaty of Versailles
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The Treaty of Sevres officially ends the war between the Allies and the Ottoman Empire and marks the beginning of the latter’s partitioning. Only the territory that becomes Turkey is independent of British and French control.