Emperor Romulus Augustus was deposed by the Germanic King Odoacer if I remember correctly.
Answer:
The great depression and the roaring 20s. The roaring 20s were a fun time that nobody cared how much money they spent and that created the great depression.
I believe the answer is: Immigrants were associated with anarchism and communism
During that period, united states was involved in the cold war against the Soviet Union. At that time, most people were scared that the agents from communist countries could come into united states through immigration process, which create the anti-immigration hysteria.