The Korean War in 1950 was the first event that tested the U.S. policy of containment in Asia. The war resulted from North Korea's invasion of South Korea, which was seen as a threat to stability in the region and to U.S. interests in Asia. The United States and its allies intervened to support South Korea in order to prevent the spread of communism in the region, marking the first major test of the policy of containment in Asia.
