What did the change in immigration policies between the 1920s and the 1960s reveal about the United States?

In the 1920s, immigration laws used quotas that favored immigrants from some regions, especially northern Europe, and restricted others. By the 1960s, the United States ended the national-origins quota system, signaling a move toward greater openness and equality in immigration. The change best supports the idea that the country was becoming more open to diversity and equality.

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