Why was it important that the United States contained communism in the late 1940’s and early 1950’s?

Two gymnastics teams are intense rivals. the first team has started recruiting new gymnasts from different cities and even foreign countires in an effort to build a stronger team. after learning this, the secondteam begins its own recruitment campaign to find better gymnasts. over a period of months, each team recruits dozens of players, each time trying to find a better recruit than its rivals most recent addition. which idea from the cold war is most similar to this scenario

Which is true about the monroe doctrine?

Which country was the last to join the allied powers? o great britain o france o united states o china