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Which of the following explains the MAIN reason German U-boats began sinking neutral American merchant ships in 1915?
Germany had a strained relationship with the United States for several decades prior to the outbreak of war.
The U.S. had been secretly supplying the British in violation of America's neutral stance on the war.
German U-boat officers often misjudged American vessels for British vessels.
The American naval escort of the ships often fires first upon the German U-boats.
The effective British blockade of the German coastline, by default, supplied the British more than the Germans.