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The u.s entered the war because of unrestricted submarine warfare . Germany sunk the u.s ship, lusitania killing 1,198 people.another reason the u.s entered the war was because of the Zimmerman note that Germany sent Mexico,saying that if Mexico invaded the u.s they would gain all the land they lost when they fought the Mexico American war.

The u.s entered the war because of unrestricted submarine warfare . Germany sunk the u.s ship, lusitania killing 1,198 people.another reason the u.s entered the war was because of the Zimmerman note that Germany sent Mexico,saying that if Mexico invaded the u.s they would gain all the land they lost when they fought the Mexico American war.

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13y ago

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