Answer:
The domino effect.
Explanation:
The Domino effect is the theory that when one country falls to communism then more will soon follow, one by one. This is what got us into the Cold War and all conflicts surrounding it, including the Korean and Vietnam War.
The cultural revolution began in the 14th century and ended in the 17th, hope this helps
Wilson wanted to created lasting peace across nations, so aimed for the creation of the League of Nations(later known as UN). The United States never joined it, and many people didn't want the country getting involved in foreign affairs