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Franz Ferdinand and his wife were assassinated by Gavrilo Princip, while visiting Sarajevo.
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The Panama Canal is opened up to traffic going through.
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The allies pushed the German lines back 40 miles north of the Aisne River.
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Italy remained neutral until 1915.
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The battle began with a 21 hour artillery barrage, then 1 million German Fifth Army soldiers advanced on 200,000 French defenders.
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The allied powers launched an offensive near the Somme River in Northern Francce. Their goal was to exhaust the enemy's reserves, In the battle British forces suffered 60,000 casualties
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Paul von Hindenburg replaces Erich von Falkenhayn as German Chief of Staff.
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German torpedoes sank five American Ships
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This note proposed a Mexican alliance with Germany. The cable offered German support to help Mexico "reconquer the lost territory in New Mexico, Texas, and Arizona."
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President Woodrow Wilson concluded that the U.S. could no longer stay neutral.
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It required men between ages 21-30 to register with the local draft boards
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First American troops land in France
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These soldiers helped France fight for their freedom because the U.S. was repaying the French for their help during the Revolutionary War.
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The Americans suffered 120,000 casualties.