Why did the united states conduct military operations in korea? a. they were fighting against the chinese in south korea. b. they didn't want communist south korea to gain more power. c. they were fighting against the russians in north korea. d. they didn't want communist north korea to gain more power.

The United States conducted military operations in Korea because D) They didn't want Communist North Korea to gain more power.  The United States was an ally of South Korea so when the North Koreans tried to invade South Korea the United States set up there operations in Korea to prevent the further spread of communism in Korea. It was at this point that the United States entered the war.

answer; i believe its (cpr);