2.Why did the US
fight a war there
in 1950-1953?

The Korean War (1950-1953) was the first military action of the Cold War. It was sparked by the June 25, 1950 invasion of South Korea by 75,000 members of the North Korean People's Army. ... The Korean War was a civil conflict that became a proxy war between superpowers clashing over communism and democracy

Hope it helps ya ItzAlex

Explanation:

The Red Scare led to B., immigration restrictions