Answer:
The main reason the US joined WWII was because of the attack on the pearl harbor base in Hawaii.
Explanation:
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<span>As for many Americans, the Second World War boosted the economic prospects of many African Americans. In particular, war industries created a demand for labor, which many black workers, including black women, were able to fill. Thousands of African Americans moved north to industrial centers, but also to places like California, which saw tremendous population growth during the war due to the war industries that developed there.</span>
