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Answer:
The new railroads in the West occasioned by the Civil War opened up the area to economic development and new settlers. American settlers from the East entered via the Mississippi to ranch farm and mine. Native American settlers also poured from Deep South after being convinced that prosperity was only found in the West. Chinese workers constructing the railroads worsened diversity of the population in this region.
Anne Frank, the diary of a young girl.
It's number 1. The bombing of Pearl Harbor, Hawaii caused the US to declare war the very next day.
