Nazi Germany and the Soviet Union had a non aggression pact. When Germany's attempt to conquer England failed Hitler turned his attention to the Soviet Union. When Germany broke the treaty with the Soviet Union the Soviet Union asked to join the Allies in the fight against the Axis Powers.
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Answer:
Senator Charles Sumner, an abolitionist leader before the Civil War and a powerful foe of conciliation toward states that had seceded after the war, considered his field to be "in morals, not politics." He is best remembered for surviving an attack by Representative Preston Brooks in 1856 during which Brooks beat Sumner with a cane on the Senate floor. Brooks' attack was a sign of the increasing hostility between the North and South in the years leading up to the Civil War.
Zimmermann telegram- Nothing like negotiating with a neighbor to invade their front lawn.
Unrestricted submarine warfare- Sinking ships owned by the US constantly is already making us angry.
and the sinking of the Lusitania- Now this wasn't the final straw but it did indeed shake US support for Germany and caused outrage all over the USA.