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Austria joined an investigation to see how Ferdinant died, then they struck back.
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The Turnks joined the Central Powers. They then cut off crucial Allied supply lines to Russia through the Dardanelles, a vital straight connecting the Black Sea and Mediterranean.
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Lusitania sinkingA German submarine sinks the passenger liner Lusitania. The ship carries 1,198 people, 128 of them Americans.
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unnecassary sinkingA German submarine torpedoed the British liner Lusitania off the coast of Ireland. Almost 1,200 troops were killed.
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Battle of GallipoliAfter 10 months and more than 200,000 casualties, the Allies finally withdrew from the Dardanelles.
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Morale collapses Despite inspiring propagandas, the morale of troops and civilians had plunged. Germany was sending 15-year-old recruits to the front.
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Germany resumes unrestricted submarine warfare in European waterways. This act, more than any other, draws the United States into the war and causes the eventual defeat of Germany.
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russian revolutionBread riots in St. Petersburg erupted into a revolution that that brought down the Russian monarchy.
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Wilson agreesPresident Wilson outlines his case for war to Congress.
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us enters warCongress authorizes a declaration of war against Germany. The United States enters World War I on the side of France and Britain.
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Congress passes the Selective Service Act authorizing the draft. Although criticized for destroying democracy at home while fighting for it abroad, President Wilson claims he sees no other option and signs the bill into law.
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The Germans sign a peace treaty with the new Bolshevik government of Russia. The terms of the treaty give Germany huge tracts of land that had been the Ukraine and Poland, and peace on the Eastern Front allows Germany to shift soldiers to the Western Front, causing serious problems for the French, British, and Americans.
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The Americans attack the Germans at Chateau-Thierry. This battle would morph into the larger Battle of Belleau Wood.
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The Battle of Belleau Wood begins as the U.S. Marine Corps attacks the Germans across an open field of wheat, suffering huge casualties.
