The number of immigrants dropped after World War I. What is one reason this happened?

After 1914, immigration dropped off because of the war, and later because of immigration restrictions imposed in the 1920s.

Explanation:

The reasons these new immigrants made the journey to America differed little from those of their predecessors. Escaping religious, racial, and political persecution, or seeking relief from a lack of economic opportunity or famine still pushed many immigrants out of their homelands.

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