America remained neutral in the early years of the war. President Woodrow Wilson didn’t want to get tangled up in a war across the Atlantic Ocean. Germany had a guideline called “unrestricted submarine warfare.” Germany was to attack any ship leaving or coming to a British port. Germany attack a non militant ship ‘The Lusitania,’ which killed 1,200 people including 120 United States citizens. America was enraged with Germany’s actions so Germany agreed to end their policy of unrestricted submarine warfare because they feared the US entering the war. By 1917 Germany realized they had to take down the British Navy to win the war, so they abandoned their arrangement with the US and began attacking at Britain's civilian ships once again.
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