I believe the answer is A, The Dawes Act.
The Dawes Act included the sale of native american land to settlers in the west.
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Answer:
On the Invasion of Poland, It had poland collapse in the beginning stages of the war. The invasion of france lead to years of french resistance after its collapse. The invasion of the Soviet Union is what ultimately lead to the end of the war, D-Day would not have been possible without Germany in a two front war. The attack on Pearl Harbor is what lead to the end of the war as We know it.