The Truman Doctrine in 1947 and the Marshall Plan were American responses aimed at containing Soviet expansion and rebuilding a stable, capitalist Europe. His policies of *glasnost* (openness) and *perestroika* (restructuring) were intended to revitalize the Soviet system but inadvertently loosened the rigid control over Eastern Europe.
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This wave of change was largely driven by internal populations, emboldened by Gorbachev's refusal to intervene militarily, a stark contrast to past Soviet actions in Hungary (1956) and Czechoslovakia (1968). Simultaneously, economic stagnation and the immense financial burden of the arms race weakened the Soviet state, making the old model of control unsustainable.
There were significant moments of relaxation and diplomatic engagement, often driven by the ever-present threat of nuclear annihilation. The Collapse of the Eastern Bloc The popular revolutions across Eastern Europe in 1989 stand as the most visible symbol of the Cold War's end.
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While the alliance between the United States, Great Britain, and the Soviet Union held to defeat Nazi Germany, deep ideological differences and mutual suspicion began to fracture the partnership almost immediately. In response, the Soviet Union formed the Warsaw Pact in 1955, cementing the division of the continent along what Winston Churchill famously termed an "Iron Curtain.
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