What were some ways in which the united states showed signs of isolationism after world war 1

The majority of Americans did not want more soldiers dying in foreign wars thousands of miles away. They were afraid of the massive cost of future wars, and of foreign people coming into the US, which was why acts were passed, such as the Immigration Quota Act of 1921. (It said that immigrants had to pass a literacy test, and that only a certain number of immigrants were allowed in each year). Americans did not want immigrants to take jobs because wages were lower since the immigrants would not join labor unions; they accepted lower wages. Americans also feared immigrants because of WW1 and the new political ideas that they brought (like communism).