The event that caused the United States to enter World War 2 was the Japanese bombing of Pearl Harbor.
It seems that you have missed the attached image to this, but anyway, according to what I have searched, the area that <span>lies directly east of the Rocky Mountains in the center of North America is the GREAT PLAINS. Hope this is the answer that you are looking for. </span>
Answer:
To protect the northern way of life. What was one effect of the Emancipation Proclamation? It added the abolition of slavery in the South to the Union's war goals.
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