Final answer:
Satellite nations were countries under the influence or control of a more powerful country, particularly during the Cold War. The term is often associated with Eastern European countries that were controlled by the USSR and were part of the Warsaw Pact.
Step-by-step explanation:
Satellite nations were countries that were nominally independent but in reality, were under heavy political and military influence or control by another nation. In the context of the Cold War, the term mainly refers to Eastern European nations that were aligned with or under the control of the Union of Soviet Socialist Republics (USSR). These nations were part of the Warsaw Pact, a military and political alliance among the communist nations of Eastern Europe, which stood in opposition to the NATO alliance led by the United States and other Western countries.
The Truman Doctrine was an American policy to stop Soviet expansion during the Cold War. The United States provided political, military, and economic assistance to all democratic nations under threat from external or internal authoritarian forces. This doctrine was a significant step in starting the Cold War, as it represented a public acknowledgment of the ideological battle between the capitalist West and the communist East.
During the Cold War, especially in the 1950s and 1960s, there were various uprisings in Soviet satellite states such as Hungary, Poland, and Czechoslovakia. The rebellions in these countries were suppressed by the USSR, reaffirming the control that the Soviet Union had over these satellite states.