Answer:On April 2, 1917, President Woodrow Wilson went before a joint session of Congress to request a declaration of war against Germany. ... Germany's resumption of submarine attacks on passenger and merchant ships in 1917 became the primary motivation behind Wilson's decision to lead the United States into World War I.
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WW1-Because they were attacking american merchant and ships
WW2- Because they had a role in the attack of pearl harbor
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