Korea was divided into two. The Republic of Korea was proclaimed and Democratic People's Republic of Korea.
North Korea invades South Korea with 135,000 men, initiating the Korean War.
Truman approves NSC-81/1.
US Army crosses 38TH Parallel near Kaesong.
US Marines/Infantry surrounded by Chinese Communist forces at Chosin Reservoir.
Peace Treaty signed at Panmunjom. 38th parallel reset as boundary between communist North and anti-communist South.