Change in immigration policies between the 1920 and the 1960 reveal about the united states

The change in immigration policies between the 1920 and 1960 reveals a discriminatory Immigration policy in the United States.

In 1921, the Congress enacted the Emergency Quota Act, which set national immigration quotas, followed by the Immigration Act of 1924 which pointed at further restricting immigrants from Southern and Eastern Europe, particularly Jews, Italians, and Slavs, and consolidated the prohibition of Asian immigration.

The U.S. government sponsored a Mexican Repatriation program between 1929 and 1936, which was intended to encourage people to voluntarily move to Mexico, but thousands were deported against their will. Most of the Jewish refugees fleeing the Nazis and World War II were barred from coming to the United States. In the post-war era, the Justice Department launched Operation Wetback, under which Mexicans were deported in 1954.

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the answer would be:

b. race