AP World History: Modern · Lesson 2 of 8 · Unit 8

Effects of the Cold War

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The Cold War (c. 1945–1991) transformed global governance by turning decolonizing nations in Asia, Africa, and Latin America into ideological and military battlegrounds. On the AP exam, you must connect superpower rivalry (NATO vs. the Warsaw Pact, nuclear proliferation) directly to local postcolonial conflicts—especially in stimulus-based multiple-choice sets, short-answer questions (SAQs), and essays testing causation and comparison.

By the end you’ll be able to

Compare the ways in which the United States and the Soviet Union sought to maintain influence over the course of the Cold War.
Explain how the Cold War produced new military alliances, including NATO and the Warsaw Pact, and led to nuclear proliferation.
Explain how the Cold War led to proxy wars between and within postcolonial states in Latin America, Africa and Asia, such as the Korean War, the Angolan Civil War and the Sandinista–Contra conflict in Nicaragua.

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What the exam asks

Compare the strategies the United States and the Soviet Union used to maintain and expand global influence.
Explain how the Cold War generated new military alliances and nuclear proliferation.
Explain how superpower rivalry caused or intensified proxy wars in postcolonial Latin America, Africa, and Asia.
Explain how the Cold War reached beyond ideology to reshape global economic, political, social, and cultural life.

Core ideas

Superpower influence: Alliances and the nuclear arms race

Both the United States and the Soviet Union sought global hegemony without triggering a direct, civilization-ending war between themselves—a deterrence dynamic known as Mutually Assured Destruction (MAD).

Military Alliances (GOV): The United States formed the North Atlantic Treaty Organization (NATO) in 1949 with Western European allies to contain Soviet expansion, later adding regional pacts like SEATO (Southeast Asia) and CENTO (Central Treaty Organization). In response to West Germany joining NATO, the USSR created the Warsaw Pact in 1955 with its Eastern European satellite states.
Comparing Superpower Methods: Both superpowers used economic aid, covert operations (CIA and KGB), arms sales, and military interventions. However, the U.S. primarily relied on economic containment (such as the Marshall Plan) and backing anti-communist regimes (including authoritarian dictatorships) to protect capitalist markets, whereas the USSR enforced strict ideological orthodoxy in Eastern Europe (crushing uprisings in Hungary in 1956 and Czechoslovakia in 1968) and funded revolutionary socialist movements abroad.
Nuclear Proliferation: After the U.S. (1945) and USSR (1949) developed atomic and thermonuclear weapons, both stockpiled tens of thousands of warheads and intercontinental ballistic missiles (ICBMs). Deploying nuclear missiles to forward bases—most famously Soviet missiles in Cuba, sparking the 1962 Cuban Missile Crisis—brought the world to the brink of nuclear war and later prompted treaties like the Nuclear Non-Proliferation Treaty (1968).