The United States entered the Korean War to stop the spread of communism. In 1950, communist North Korea invaded South Korea. The United States and its allies helped South Korea. The war ended in 1953. The United States entered the Korean War to stop the spread of communism.
From the archives
Marines in the Korean War 001Sergeant Frank C. Kerr, U.S. Marines (Official Marine Corps Photo # A4852) (http://www.tecom.usmc.mil/HD/images/KWC/Combat_photos/Chosin/A-4852.JPG), via Wikimedia Commons · Public domain
