What did the change in immigration policies between the 1920s and the 1960s

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

1) The country was becoming more open to diversity any quality

2) The country was trying to maintain a uniform population

3) The country was not ready to act with the quality and fairness

4)The country was exerting more control over the ethnicity this city of immigrants

The correct answer is - 2) The country was trying to maintain a uniform population.

In the period between 1920 and 1960 the immigration policies of the United States were tightened and stricter, and the immigration was selective. In this period, white people from the European continent were favored and allowed to migrate into the United States, while black people and Asians were not allowed to immigrate into the country. This was with the purpose of maintaining a uniform population in the country.

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i would think it's industries and hydroelectric power