According to the lecture, international politics caused many Puerto Ricans and Cubans to move to the U.S. in the 1950s and 1960s. The correct option among all the options given in the question is option "c. At first, just a few Puerto Ricans migrated to the United States of America. Later on the flow of the immigrants increased.
Maybe the one at the bottom
Answer: Wanted to expand westward but were not allowed to.
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The Great Depression was an economic downfall that forced many families into poverty. In October of 1928, there was a major stock market crash which fueled the beginning of the depression.