The first instance in which the United States executed the “containment policy” with military action, United States Marines land in South Korea, following North Korea’s advance into South Korea. President Truman, through the War Powers Act, deployed American forces to the Korean Peninsula, to aid the largely-overrun South Korean forces. America’s intervention resulted in North and South Korea being divided at the 38th Parallel. Thus, the spread of communism was halted in Korea.
