During 1915, the Ententé set up a blockade, blocking the supply of Germany, Germany then started using U-boats for unrestricted submarine warfare, it destroyed ships with Americans in them, causing tensions between America and Germany.
However, this was not the reason America declared war on Germany.
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World War One
Non-FictionThe events of World War One from the assasination of Archduke Franz Ferdinand to the abdication of the Kaiser, and the capitulation of Germany from 1914 to 1918. Enjoy reading.