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The border of British Guiana and Venezuela.
As Allies of Uk and France the US went to war in Euope when Germany declared war on US on Dec 10, 1941
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The sinking of the civilian ship Lusitania by a German U-boat (submarine) which had US civilians on it angered them to becoming involved against the Germans.
At the beginning of WWI, US trade with Europe increased because President Wilson claimed neutrality; the US could trade with both sides. However, once the US became involved, trade decreased.