Answer:
Korea - communist and anti-comunist forces...
Taiwan - Nationalists fled their homeland...
Japan - The United States helped establish...
China - Communists led by Mao Zedong
Explanation:
During the Cold War period, immediately after WWII there were many conflicts and transformations in Asia. The Korean War culminated with the division of the territory into North Korea and South Korea, where the North adopted a communist government and the south became democratic.
The Chinese Civil War also constituted a fight between the existing democratic government and a rising group seeking to establish a communist regime led by Mao Zedong. The Nationalists were forced to leave China and settled in Taiwan, while the rest of China became (and still remains) a communist country.
After the devastation caused by the atomic bombs launched over Hiroshima and Nagasaki, Japan was in deep political and economic trouble. The United States helped to rebuild the country by establishing a democratic government and providing funds to industrialize its economy.