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Archduke Franz Ferdinand and his wife, Sophie, visited Serbia. Archduke Franz Ferdinand was the prince and next heir to the Austria-Hungary throne. Austria had overtaken Bosnia. This angered Bonian, Serbian, and slovic ethnic groups. Serbian terrorists gathered at the royal visit and assassinated the royal couple by hooting them.
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Germany declared that waters around Britain was a warzone. A German U-boat sank The Lusitania. Although it did carry weapons and ammunition, it also carried innocent civilians, including American civilians.
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Germany sinks another british ship, the Arabic, killing two Americans.
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President Woodrow Wilson made a speach to the senate stating he wanted to find a way to end the war in Europe.
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President Woodrow Wilson remindes the U.S. of the loss of life and the hinderance on trade the war has brought to the U.S.
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In a vote of 82 to 6, the Senate declares war on Germany
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On a vote of 373 to 50, the House decided that the U.S. had entered the war.