It should be noted that some of the happenings in American history from the 1920's to the 1940's include immigration, World War, etc.
It should be noted that migration simply means the movement of people from one area to another in search of better opportunities, education, etc.
The prompt selected in this case is the first prompt. It depicts the happening in American history from the 1920's to the 1940's.
During this period, there was World War. Also, when there was industrialization in the country, this lead to more people coming into the country.
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