After Polarity in International Relataions

... both the Soviet military and the international Communist movement were controlled by the Kremlin. A country could be taken over by military conquest or by a communist revolution or coup, and communists took part in military actions. According to the Domino Theory, first advanced during Truman’s presidency, if a country came under the influence of Communists a “domino effect” would follow that would spread communism to other nearby countries. Despite its surface plausibility, however,...