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When did the third wave of immigrants in the United States occur?

The third wave of American immigrants occurred in 188 1 to 1920.

The number of immigrants increased to 23.5 million. After World War II, with the rationalization of American people's attitude towards immigrants, the contribution of immigrants to the United States was gradually recognized by most Americans. As US Secretary of Labor Zhao Xiaolan said, "The United States should thank immigrants for their contributions. The huge wave of immigrants has brought rich cultural heritage to the United States and provided impetus for its development. "