Everything you need to master Unit 9 — the Reagan Revolution and conservative ascendancy, the end of the Cold War, globalization and the digital revolution, 9/11 and the War on Terror, demographic transformation, and the major political and social shifts of contemporary America.
8–10% of the AP exam
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Unit 9 covers Period 9: Contemporary America, 1980–Present — from Reagan's election through the present day. This period saw a conservative political revolution that reshaped American politics, the end of the Cold War, the digital revolution, the rise of globalization, the 9/11 attacks and War on Terror, and dramatic demographic and cultural change.
The College Board wants you to understand the Reagan Revolution (supply-side economics, deregulation, the New Right), the end of the Cold War (Gorbachev, fall of the Berlin Wall, Soviet collapse 1991), globalization and the digital economy (NAFTA, the tech boom, growing inequality, 2008 Great Recession), immigration and demographic shifts, and the 21st-century challenges (9/11, the War on Terror, the Obama presidency, marriage equality, Black Lives Matter, and COVID-19).
Unit 9 makes up roughly 4–6% of the AP US History exam — proportionally smaller, but Period 9 themes (conservative resurgence, globalization, demographic shifts) often appear in thematic essays and broader prompts.
Key terms preview
A taste of what you'll find in The Essentials and Flashcards.
Reagan Revolution
Conservative political shift beginning with Reagan's 1980 election; rejected New Deal liberalism for free markets, lower taxes, and traditional values.
December 1991 dissolution of the Soviet Union; ended 45 years of U.S.-Soviet conflict; left the U.S. as the world's sole superpower.
NAFTA (1994)
North American Free Trade Agreement eliminating most trade barriers between U.S., Canada, and Mexico; boosted trade but accelerated outsourcing of manufacturing jobs.
September 11 Attacks
Al-Qaeda hijacked four planes (2001); destroyed the World Trade Center and damaged the Pentagon; killed nearly 3,000; transformed U.S. foreign policy.
Affordable Care Act (2010)
Obama's healthcare reform requiring health insurance for most Americans, expanding Medicaid, banning denial for preexisting conditions.
1. The conservative revolution reshaped American politics
Reagan's 1980 election ended the New Deal political order. Tax cuts, deregulation, and a more assertive foreign policy became the new mainstream — even Bill Clinton's Democratic Party adopted free trade, welfare reform, and balanced budgets. The shift permanently redefined the boundaries of American politics.
2. Globalization and technology transformed the economy — unevenly
NAFTA, the WTO, and the digital revolution integrated the U.S. into a global economy and produced enormous wealth at the top. But manufacturing jobs disappeared, real wages stagnated for the middle class, and inequality grew dramatically. The 2008 Great Recession exposed how vulnerable the new system was.
3. 9/11 and demographic change defined the 21st century
The September 11 attacks reshaped foreign policy through the War on Terror — including invasions of Afghanistan and Iraq and the PATRIOT Act. Meanwhile, Latino and Asian immigration transformed American demographics, Obama became the first Black president, and movements for marriage equality, racial justice, and political realignment defined a polarized new era.