How and why did the Cold War come to an end?
Explain the events and causes that ended the Cold War, including détente, Reagan's policies, the reforms of Gorbachev, the fall of the Berlin Wall, and the collapse of the Soviet Union (Tennessee Academic Standards for Social Studies, United States History and Geography, US.47).
A standard-level answer on the end of the Cold War for the Tennessee US History EOC: détente and renewed tensions, Reagan's military buildup and pressure, Gorbachev's reforms (glasnost and perestroika), the fall of the Berlin Wall in 1989, and the collapse of the Soviet Union in 1991.
Reviewed by: AI editorial process; not yet individually human-reviewed
Have a quick question? Jump to the Q&A page
Jump to a section
What this topic is asking
Standard US.47 asks how and why the Cold War ended. For the EOC that means understanding the swings between détente and renewed tension, President Reagan's military buildup and pressure, Soviet leader Gorbachev's reforms (glasnost and perestroika), the fall of the Berlin Wall (1989), and the collapse of the Soviet Union (1991).
From détente to renewed tension
The Cold War was not a steady freeze; it had thaws and chills. In the 1970s, the superpowers pursued détente, a deliberate easing of tensions that included arms-control agreements (such as SALT) and more contact. But tensions returned at the end of the decade, especially after the Soviet invasion of Afghanistan (1979), which the United States opposed.
Reagan's hard line
Gorbachev's reforms
The most important changes came from within the Soviet Union, under its reform-minded leader Mikhail Gorbachev.
Gorbachev also eased the Soviet grip on Eastern Europe and pursued arms reductions with Reagan, reducing the danger of nuclear war.
1989 and the fall of the Berlin Wall
In 1989, a wave of mostly peaceful revolutions swept communist governments from power across Eastern Europe (Poland, Hungary, Czechoslovakia, and others). The most powerful symbol came in Berlin: the Berlin Wall, which had divided communist East Berlin from West Berlin since 1961, was opened in November 1989, and crowds tore it down. Germany was reunified in 1990.
The collapse of the Soviet Union
The reforms and revolutions could not be contained. In 1991, the Soviet Union dissolved, breaking into independent nations (including Russia and others). The Cold War was over. The United States emerged as the world's sole superpower, beginning a new era of American global leadership (and new challenges).
Why this matters for the EOC
This topic supplies cause-and-effect items (what factors ended the Cold War), symbolism items (the fall of the Berlin Wall), and sequencing items. The big idea is that the Cold War ended through a combination of internal Soviet reform and weakness and external pressure, leaving the United States as the lone superpower, the bridge to the modern era.
Try this
Q1. Explain the significance of the fall of the Berlin Wall in 1989. [2]
- Cue. It symbolized the collapse of communist control in Eastern Europe and signaled the end of the Cold War; Germany was soon reunified.
Q2. Explain what glasnost and perestroika meant. [2]
- Cue. Glasnost was openness and greater freedom of expression; perestroika was economic restructuring. Together they weakened the Soviet system.
Exam-style practice questions
Practice questions written in the style of TDOE exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
TN US History EOC (style)1 marksThe fall of the Berlin Wall in 1989 symbolized (A) the start of the Cold War. (B) the collapse of communist control in Eastern Europe and the approaching end of the Cold War. (C) the building of the iron curtain. (D) the Cuban Missile Crisis.Show worked answer →
A 1-point multiple-choice item on US.47.
The correct answer is B. The Berlin Wall had divided communist East Berlin from West Berlin since 1961. Its fall in 1989 symbolized the collapse of communist control in Eastern Europe and signaled that the Cold War was ending; Germany was reunified soon after.
A and C describe the Cold War's beginning, and D was a 1962 crisis. The test rewards linking the fall of the Berlin Wall to the end of the Cold War.
TN US History EOC (style)2 marksSoviet leader Mikhail Gorbachev introduced reforms called glasnost and perestroika. (a) Briefly explain what these reforms meant. (b) State one other factor that contributed to the end of the Cold War.Show worked answer →
A 2-point item on the end of the Cold War (US.47).
(a) 1 point: glasnost meant greater openness and freedom of expression, and perestroika meant restructuring or reforming the Soviet economy; together they loosened control and unintentionally weakened the communist system.
(b) 1 point: any one valid factor, such as President Reagan's military buildup and pressure on the Soviet Union; the heavy economic burden of the arms race and the war in Afghanistan; or rising demands for freedom across Eastern Europe. Markers reward explaining glasnost and perestroika and naming one additional factor.
Related dot points
- Explain the origins of the Cold War, the policy of containment, and early measures such as the Truman Doctrine, the Marshall Plan, and NATO (Tennessee Academic Standards for Social Studies, United States History and Geography, US.35).
A standard-level answer on the origins of the Cold War for the Tennessee US History EOC: the clash of superpowers and ideologies, the iron curtain, containment, the Truman Doctrine, the Marshall Plan, the Berlin Airlift, and the formation of NATO.
- Explain the major Cold War conflicts and crises, including the Korean War, the Cuban Missile Crisis, the arms and space races, and the Vietnam War (Tennessee Academic Standards for Social Studies, United States History and Geography, US.36 and US.42).
A standard-level answer on Cold War conflicts for the Tennessee US History EOC: the Korean War, the arms race and the space race, the Cuban Missile Crisis, and the Vietnam War, including escalation, the antiwar movement, and Vietnamization.
- Explain the rise of modern conservatism, including the Reagan Revolution, supply-side economics, debates over the role of government, and the major presidencies of the late twentieth century (Tennessee Academic Standards for Social Studies, United States History and Geography, US.48).
A standard-level answer on the conservative turn for the Tennessee US History EOC: the rise of modern conservatism, the Reagan Revolution and supply-side economics, the debate over the size of government, and the presidencies from Reagan through the end of the century.
- Explain the September 11, 2001, attacks, the war on terror, and the major developments and challenges of the United States in the early twenty-first century (Tennessee Academic Standards for Social Studies, United States History and Geography, US.51 and US.60).
A standard-level answer on the twenty-first century for the Tennessee US History EOC: the September 11 attacks, the war on terror in Afghanistan and Iraq, the security-versus-liberty debate, the Great Recession, and major developments such as the first Black president.
- Explain the impact of the technology and communications revolution and economic globalization on the United States from 1970 to the present (Tennessee Academic Standards for Social Studies, United States History and Geography, US.50).
A standard-level answer on the digital revolution and globalization for the Tennessee US History EOC: the rise of computers, the internet, and instant communication; the shift to a service and information economy; free trade and global supply chains; and the benefits and costs of globalization.
Sources & how we know this
- Social Studies Standards — Tennessee Department of Education (2019)
- TCAP US History End of Course Assessment Overview — Tennessee Department of Education (2023)