What events in 1919 fed the fears of Americans regarding a possible Bolshevik revolution in America?

The Event was call the Red Scare.

Explanation:

During the 1919-1920 Red Scare many in the United States feared recent immigrants and leftists, particularly those who supported the philosophy of communism, socialism, or anarchism. Red Scare causes Included:

- The Bolshevik Revolution in Russia, which led many to fear that refugees from Russia, Southern Europe and Eastern Europe in particular wanted to overthrow the government of the United States;

- World War I, which led many to accept strong sympathies of nationalism and anti-immigrants;

- The end of World War I, which prompted the need to decrease production and increase unemployment. and others.