Chinese Civil War
The Chinese Civil War (1945 - 1949) was a military conflict involving the Chinese Communists and supporters, notably the Soviet Union, and Kuomintang and supporters, notably the United States. The war is often described as occurring between 1945 and 1949, but there were conflicts both before and after this.
The Communists were victorious and gained control over mainland China. The Kuomintang retreated to Taiwan. To this day no armistice or peace treaty has ever been signed, and the debate continues as to whether the civil war has legally ended.