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After a decade of unstable alliances and military buildups, World War I was triggered in 1914 by the assassination of Archduke Ferdinand.
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Because They didn't want to be involved in any affairs of another country and not to favor any specific side
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An U-20 torpedoed the ship and sank the ship and killed 1,198 people on board, including 125 U.S. citizens.
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United States would distracted and so problem United states would not time to help the Allies in Europe.
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It ended in 1919 with the Treaty of Versailles.
