How successful was the US in containing communism in Korea?

The U.S. was partially successful in containing communism in Korea through its military intervention during the Korean War (1950-1953). While the war ended in an armistice and established a demilitarized zone, effectively splitting Korea into North and South, communism was contained in the North, which remained under Soviet influence. However, the South developed into a non-communist state with U.S. support, leading to significant economic and political differences between the two Koreas. Ultimately, the containment strategy succeeded in preventing the spread of communism beyond the 38th parallel.