During World War I, Germany unleashed a much improved version of an old weapon, the submarine, in its war-making effort against its enemies. Thoroughly modernized and nightmarishly effective, the submarines wielded by Germany causes great losses among Allied merchants and severely restricted sea-borne trade among the same.
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The first world war was waged between 1914 and 1918. The war was between the allies (non German European powers) and Germany. America kept out of direct commitment to the war (but it did trade with the allies) until 1917 when it sent troops to Europe on the side of the allies.
During most of WW1, the US remained a neutral nation. It tried to trade with both Great Britain and Germany, but Britain didn't allow the US to trade with Germany, so it set up a blockade.
President Wilson was unwilling to cut off trade with Britain in World War 1 because the profitable trade with the Allies was extremely important to the United States.
US Business Interests in world war one mainly centered around being able to continue to trade with Britain, France and the rest of the Allies. This had been hampered by Germany's unrestricted submarine warfare in the seas.
Germany's war with our brethren in England; unrestricted submarine warfare in the Atlantic Ocean.