HELP PLEASE What was going on in the world and the US to make immigration reach one of its lowest points during 1931-1940?

Along with the job crisis and food shortages that affected all U.S. workers, Mexicans and Mexican Americans had to face an additional threat: deportation. As unemployment swept the U.S., hostility to immigrant workers grew, and the government began a program of repatriating immigrants to Mexico.

Explanation:

d: social contract theory

b, public works good luck