Russia, United States, Japan
Answer:
The United States wanted to maintain its superpower status and contain communism by maintaining the Cold War with the Soviet Union. In this case, conflict in Korea, Vietnam, and Cuba resulted from the Cold War. The American government felt threatened by the Communist government and wanted to see democracy prevail over communism. In this case, many times America felt forced to protect its government and beliefs, and to protect other countries from falling to communism.
The Mongol Empire, with its peak size under the rule of Kublai Khan around the year of 1279, included parts of modern Russia in the North, modern day Korea, and modern China in the South on one end of the Asian continent. It stretched through the Asian continent all the way to modern day Hungary in Europe. It also included parts of the modern Middle East such as Iraq and Iran. The total area of the Mongol Empire in its peak was around 40 million km^2.
