During the Cold War period, the United States entered conflicts with Korea and Vietnam to prevent the spread of communism. Some
theorists believed that these regions surrounding the Soviet Union had to be protected because gaining control of these areas would lead to world domination. Which of the following theories is MOST closely related to this idea? A) Dependency theory
B) Domino theory
C) Heartland theory
D) Rimland theory
E) Containment theory
