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The causes of the US entry into WW1 included the Sinking of the passenger ship the Lusitania which was sunk by a German U-Boat. ... Wilson asked Congress to declare war against Germany, and the US entry into WW1 began on April 6, 1917
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It gained full independence as a separate country in 1830
Necessary simply states that congress has power , to make all laws which shall be necessary and proper for carrying into execution by foregoing powers,