Why did the United States take part in the Korean War? A, To establish a colony on the Korean Peninsula
B, to defend South Korea against communist aggression
C, to aid its Chinese allies against an aggressive neighbor
D, to prevent North Korea from acquiring nuclear weapons

B

Explanation:

It certainly wasn't C and D, however critics of US foreign policy would possibly cite A. I would argue in the context of the question it is definitely B.

all of the

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."