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The assassination of Archduke Franz Ferdinand was one of the key events leading up to WW1.
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The United Kingdom declares war upon Germany. The declaration was a result of German refusal to remove their troops from Belgium.
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The British ocean liner, Lusitania, is torpedoed by a German submarine off the south coast of Ireland. This played a role in the U.S. joining the war.
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President Wilson is reelected in the middle of the Mexican revolution and WW1.
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Germany begins an aerial bombing campaign against Britian using zeppelins.
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The United States formally declares war against Germany, entering WW1.
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The first American troops land in France during WW1, making a significant turning point in the conflict.
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The battle of Mons took place in Belgium, where a British force fights around 150,000 Germans.
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This date signifies the end of WW1.
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The Treaty of Versailles is signed, officially ending WW1