- Columbian Exchange
- The transfer of crops, animals, people, and diseases between the Americas, Europe, and Africa after 1492; Old World diseases devastated Native populations.
- Treaty of Tordesillas (1494)
- An agreement that divided newly encountered lands outside Europe between Spain and Portugal along a north-south line.
- Encomienda system
- A Spanish labor system granting colonists the right to demand tribute and forced labor from Native peoples in exchange for protection and Christian instruction.
- Casta system
- The racial hierarchy in Spanish America that ranked people by ancestry, with Spanish-born peninsulares at the top.
- Maize
- Corn — a staple American crop whose cultivation supported complex, settled Native societies in Mesoamerica and the present-day U.S.
- Pueblo peoples
- Southwestern Native societies who built permanent adobe settlements and farmed using irrigation in arid environments.
- Conquistadors
- Spanish soldiers and explorers, such as Cortés and Pizarro, who conquered Native empires in search of gold and glory.
- Bartolomé de las Casas
- A Spanish friar who condemned the brutal treatment of Native peoples under the encomienda system.
- Joint-stock company
- A business that pooled investors' money to fund colonization, spreading risk; used to found Jamestown.
- Hernán Cortés
- The Spanish conquistador who conquered the Aztec Empire in Mexico by 1521.
- Mestizo
- A person of mixed European and Native American ancestry in colonial Spanish America.
- Pope's role in the Americas
- The Catholic Church justified and accompanied Spanish colonization, aiming to convert Native peoples.
- Three-Sisters agriculture
- The Native practice of planting maize, beans, and squash together so the crops support one another.
- Pre-Columbian diversity
- Native societies before 1492 were highly varied, adapting their cultures and economies to local environments.
- Jamestown (1607)
- The first permanent English settlement, founded in Virginia; nearly failed before tobacco made it profitable.
- Headright system
- A grant of about 50 acres of land to anyone paying passage for a settler to the Chesapeake, fueling indentured servitude.
- Indentured servitude
- A contract of several years' unpaid labor in exchange for passage to the colonies, often ending with 'freedom dues.'
- Mayflower Compact (1620)
- An agreement by Plymouth settlers to govern themselves by majority rule — an early model of self-government.
- Puritans
- English Calvinists who founded the Massachusetts Bay Colony to build a model religious community, a 'city upon a hill.'
- Bacon's Rebellion (1676)
- An uprising of frontier settlers against Virginia's government; it hastened the shift from indentured to enslaved labor.
- Navigation Acts
- British laws requiring colonial trade to pass through England, embodying mercantilism.
- Mercantilism
- An economic theory in which colonies exist to enrich the mother country by supplying raw materials and buying its goods.
- Salutary neglect
- Britain's informal policy of loosely enforcing trade laws, allowing colonial self-government to develop.
- Triangular trade
- The Atlantic trade network exchanging enslaved Africans, raw materials, and manufactured goods among Africa, the Americas, and Europe.
- Middle Passage
- The brutal sea voyage that carried enslaved Africans across the Atlantic in horrific conditions.
- First Great Awakening
- An 18th-century wave of emotional religious revivals that challenged established churches and spread across the colonies.
- Jonathan Edwards
- A preacher of the First Great Awakening known for the sermon 'Sinners in the Hands of an Angry God.'
- Stono Rebellion (1739)
- A slave uprising in South Carolina that led to harsher slave codes.
- House of Burgesses (1619)
- The first elected representative assembly in the English colonies, in Virginia.
- New England Colonies
- Town-centered colonies based on small farms, fishing, and trade, organized around Puritan congregations.
- Middle Colonies
- Religiously tolerant, ethnically diverse colonies (e.g., Pennsylvania) known as the 'breadbasket' for grain.
- Southern Colonies
- Plantation colonies growing cash crops like tobacco and rice with indentured then enslaved labor.
- Roger Williams
- A dissenter who founded Rhode Island on principles of religious freedom and separation of church and state.
- Anne Hutchinson
- A Massachusetts woman banished for challenging Puritan authorities over religious doctrine.
- William Penn
- The Quaker founder of Pennsylvania, known for tolerance and fair dealings with Native peoples.
- French and Indian War
- The North American theater of the Seven Years' War (1754–1763); Britain won but ran up debt that led it to tax the colonies.
- Proclamation of 1763
- A British order barring colonial settlement west of the Appalachians, angering colonists.
- Stamp Act (1765)
- A direct tax on printed materials that sparked colonial protest over 'taxation without representation.'
- Townshend Acts (1767)
- British duties on imported goods like glass and tea that revived colonial boycotts.
- Boston Massacre (1770)
- A clash in which British soldiers killed five colonists, used as anti-British propaganda.
- Boston Tea Party (1773)
- A protest in which colonists dumped British tea into Boston Harbor over the Tea Act.
- Intolerable Acts (1774)
- Punitive British laws responding to the Tea Party; they unified colonial opposition.
- Common Sense
- Thomas Paine's 1776 pamphlet that argued for independence in plain language and swayed public opinion.
- Declaration of Independence (1776)
- The document, drafted by Jefferson, declaring the colonies' independence and asserting natural rights.
- Republicanism
- The belief that government rests on the consent of the people and that citizens must serve the public good.
- Articles of Confederation
- The first U.S. national government (1781–1789); too weak to tax or regulate commerce.
- Shays's Rebellion (1786–87)
- An uprising of indebted Massachusetts farmers that exposed the Articles' weakness and spurred reform.
- Constitutional Convention (1787)
- The Philadelphia meeting that drafted the U.S. Constitution to replace the Articles.
- Great Compromise
- The agreement creating a bicameral Congress: a House by population and a Senate with equal state representation.
- Three-Fifths Compromise
- An agreement counting three-fifths of the enslaved population for representation and taxation.
- Federalists
- Supporters of the Constitution and a strong central government; authors of the Federalist Papers.
- Anti-Federalists
- Opponents of the Constitution who feared central power and demanded a Bill of Rights.
- Bill of Rights (1791)
- The first ten amendments, protecting individual liberties, added to win ratification.
- Federalism
- The division of power between a national government and the states under the Constitution.
- Hamilton's financial plan
- Treasury Secretary Hamilton's program to assume debts, create a national bank, and promote manufacturing.
- Whiskey Rebellion (1794)
- A tax protest that Washington suppressed, showing the new federal government's strength.
- Washington's Farewell Address
- Washington's 1796 warning against political parties and permanent foreign alliances.
- First party system
- The split between Hamilton's Federalists and Jefferson's Democratic-Republicans.
- Northwest Ordinance (1787)
- A law organizing western territories, banning slavery in them, and outlining a path to statehood.
- Alien and Sedition Acts (1798)
- Federalist laws restricting immigrants and criticism of the government, opposed as unconstitutional.
- Louisiana Purchase (1803)
- Jefferson's acquisition of a vast territory from France, doubling the size of the United States.
- Marbury v. Madison (1803)
- The Supreme Court case that established judicial review — the power to strike down unconstitutional laws.
- War of 1812
- A war with Britain over trade and impressment that fostered American nationalism.
- Market revolution
- The early-1800s shift from local economies to a national market economy driven by transportation and factories.
- Erie Canal (1825)
- A canal linking the Great Lakes to the Hudson River, boosting trade and western settlement.
- Missouri Compromise (1820)
- An agreement admitting Missouri as a slave state and Maine as free, barring slavery north of 36°30'.
- Monroe Doctrine (1823)
- A policy warning European powers against further colonization in the Americas.
- Andrew Jackson
- The seventh president, whose era expanded white-male democracy and fought the national bank.
- Jacksonian Democracy
- The expansion of suffrage to most white men and the rise of mass political parties in the 1820s–30s.
- Spoils system
- Jackson's practice of rewarding political supporters with government jobs.
- Indian Removal Act (1830)
- A law authorizing the forced relocation of southeastern Native nations west of the Mississippi.
- Trail of Tears
- The deadly forced march of the Cherokee and others to Indian Territory after removal.
- Nullification Crisis (1832–33)
- South Carolina's claim that a state could void federal law, over the 'Tariff of Abominations.'
- Bank War
- Jackson's successful campaign to destroy the Second Bank of the United States.
- Second Great Awakening
- An early-1800s religious revival that inspired reform movements like abolition and temperance.
- Abolitionism
- The movement to end slavery, led by figures such as Frederick Douglass and William Lloyd Garrison.
- William Lloyd Garrison
- A radical abolitionist who published the anti-slavery newspaper The Liberator.
- Frederick Douglass
- A formerly enslaved abolitionist, orator, and writer who became a leading voice against slavery.
- Seneca Falls Convention (1848)
- The first women's rights convention, which issued the Declaration of Sentiments.
- Temperance movement
- A reform campaign to reduce or ban alcohol consumption.
- Cult of domesticity
- The 19th-century ideal that a woman's proper sphere was the home and moral guardianship.
- Transcendentalism
- An intellectual movement (Emerson, Thoreau) emphasizing individualism, nature, and self-reliance.
- American System
- Henry Clay's plan for a national bank, protective tariffs, and internal improvements.
- Manifest Destiny
- The 1840s belief that the U.S. was destined to expand across the continent to the Pacific.
- Lowell mills
- Early New England textile factories that employed young women, symbolizing the new factory system.
- Wilmot Proviso (1846)
- A failed proposal to ban slavery in any territory gained from the Mexican-American War.
- Mexican-American War
- An 1846–48 war that gained the U.S. vast southwestern territory, reopening the slavery debate.
- Compromise of 1850
- A package admitting California as free, applying popular sovereignty, and passing a strict Fugitive Slave Act.
- Popular sovereignty
- The idea that settlers of a territory should vote on whether to allow slavery.
- Fugitive Slave Act (1850)
- A law requiring the return of escaped enslaved people, even from free states, angering Northerners.
- Uncle Tom's Cabin
- Harriet Beecher Stowe's 1852 anti-slavery novel that intensified Northern opposition to slavery.
- Kansas-Nebraska Act (1854)
- A law applying popular sovereignty to those territories, leading to 'Bleeding Kansas.'
- Dred Scott v. Sandford (1857)
- A ruling that enslaved people were not citizens and Congress could not bar slavery in territories.
- John Brown's raid (1859)
- An abolitionist's failed attempt to spark a slave uprising at Harpers Ferry.
- Election of 1860
- Lincoln's victory, which prompted Southern states to begin seceding from the Union.
- Secession
- The withdrawal of Southern states from the Union to protect slavery, forming the Confederacy.
- Fort Sumter (1861)
- The South Carolina fort whose bombardment began the Civil War.
- Emancipation Proclamation (1863)
- Lincoln's order freeing enslaved people in Confederate territory, reframing the war's purpose.
- Battle of Gettysburg (1863)
- A decisive Union victory and turning point of the Civil War.
- Gettysburg Address
- Lincoln's 1863 speech redefining the war as a struggle for a nation 'conceived in liberty.'
- 13th Amendment (1865)
- The constitutional amendment that abolished slavery.
- 14th Amendment (1868)
- The amendment granting citizenship and equal protection of the laws to all born in the U.S.
- 15th Amendment (1870)
- The amendment barring denial of the vote based on race, color, or prior servitude.
- Reconstruction
- The 1865–1877 effort to rebuild the South and integrate freed people into national life.
- Freedmen's Bureau
- A federal agency that aided formerly enslaved people with food, schools, and labor contracts.
- Black Codes
- Southern laws after the war that restricted the rights and labor of freed Black people.
- Sharecropping
- A farming system in which laborers worked land for a share of the crop, often trapping them in debt.
- Compromise of 1877
- A deal that resolved the disputed 1876 election and ended Reconstruction by withdrawing federal troops.
- Radical Republicans
- Congressional members who pushed for harsher Reconstruction and stronger rights for freed people.
- Andrew Johnson
- The president impeached (but not removed) for clashing with Radical Republicans over Reconstruction.
- Gilded Age
- The late-1800s era of rapid industrialization and great wealth alongside deep inequality and corruption.
- Transcontinental Railroad (1869)
- The rail line linking the East and West coasts, accelerating settlement and commerce.
- Andrew Carnegie
- A steel magnate who used vertical integration and later championed the 'Gospel of Wealth.'
- John D. Rockefeller
- An oil magnate who built the Standard Oil monopoly through horizontal integration.
- Robber barons
- A critical term for industrialists accused of exploiting workers and crushing competition.
- Vertical integration
- Controlling every step of production, from raw materials to distribution.
- Horizontal integration
- Buying out competitors to dominate a single stage of an industry, forming monopolies.
- Social Darwinism
- The application of 'survival of the fittest' to society to justify laissez-faire capitalism.
- Gospel of Wealth
- Carnegie's idea that the rich have a duty to use their fortunes for the public good.
- Laissez-faire
- The economic doctrine that government should not interfere in business.
- Knights of Labor
- An early labor union open to most workers that sought broad reforms.
- American Federation of Labor
- A union of skilled workers led by Samuel Gompers focused on wages and hours.
- Haymarket Affair (1886)
- A Chicago labor rally that turned deadly, hurting the labor movement's image.
- Homestead Strike (1892)
- A violent steelworkers' strike against Carnegie's company that the union lost.
- Pullman Strike (1894)
- A nationwide railroad strike broken by federal troops and an injunction.
- Homestead Act (1862)
- A law granting 160 acres of western land to settlers who farmed it for five years.
- Dawes Act (1887)
- A law that broke up tribal lands into individual plots to assimilate Native Americans.
- Chinese Exclusion Act (1882)
- A law barring Chinese laborers from immigrating, the first major federal immigration restriction.
- New immigration
- The late-1800s wave of immigrants from southern and eastern Europe and Asia.
- Populist Party
- An 1890s farmers' and laborers' party seeking free silver, an income tax, and railroad regulation.
- Free silver
- The Populist demand to coin silver to expand the money supply and ease farmers' debts.
- Plessy v. Ferguson (1896)
- A ruling that upheld 'separate but equal,' legalizing racial segregation.
- Jim Crow laws
- State and local laws enforcing racial segregation in the South after Reconstruction.
- Tammany Hall
- A New York City political machine known for corruption and patronage in the Gilded Age.
- Interstate Commerce Act (1887)
- The first federal law regulating railroad rates and business practices.
- Progressivism
- An early-1900s reform movement that used government to curb the abuses of industrial capitalism.
- Muckrakers
- Investigative journalists, like Upton Sinclair and Ida Tarbell, who exposed corruption and abuses.
- The Jungle
- Upton Sinclair's 1906 novel exposing the meatpacking industry, spurring food-safety laws.
- Theodore Roosevelt
- A Progressive president known for trust-busting, conservation, and the Square Deal.
- Square Deal
- Theodore Roosevelt's program for consumer protection, business regulation, and conservation.
- 16th Amendment (1913)
- The amendment authorizing a federal income tax.
- 17th Amendment (1913)
- The amendment establishing the direct popular election of U.S. senators.
- 18th Amendment (1919)
- The amendment establishing Prohibition, banning the manufacture and sale of alcohol.
- 19th Amendment (1920)
- The amendment guaranteeing women the right to vote.
- Spanish-American War (1898)
- A war that ended Spanish rule in Cuba and gave the U.S. an overseas empire.
- Imperialism
- The policy of extending U.S. power overseas through territory and influence.
- Open Door Policy
- A U.S. policy seeking equal trading rights for all nations in China.
- Panama Canal
- A U.S.-built canal (opened 1914) linking the Atlantic and Pacific, boosting naval and commercial power.
- World War I
- The 1914–1918 war the U.S. entered in 1917, emerging as a world power.
- Fourteen Points
- Wilson's plan for peace after WWI, including a League of Nations.
- League of Nations
- Wilson's proposed international body for peace, which the U.S. Senate refused to join.
- Harlem Renaissance
- A 1920s flowering of African American art, music, and literature centered in Harlem.
- Great Migration
- The movement of millions of Black Americans from the rural South to Northern cities.
- Roaring Twenties
- A decade of consumer prosperity, cultural change, and new mass entertainment.
- Great Depression
- The severe economic downturn that began with the 1929 stock market crash.
- New Deal
- FDR's 1930s programs of relief, recovery, and reform to fight the Great Depression.
- Social Security Act (1935)
- A New Deal law creating old-age pensions and unemployment insurance.
- Civilian Conservation Corps
- A New Deal jobs program that employed young men in conservation work.
- Pearl Harbor (1941)
- The Japanese attack on the U.S. naval base in Hawaii that brought America into WWII.
- World War II
- The 1939–1945 global war; U.S. involvement ended the Depression and made it a superpower.
- Manhattan Project
- The secret U.S. program that developed the atomic bomb during WWII.
- Cold War
- The post-1945 rivalry between the U.S. and the Soviet Union, fought through proxies and an arms race.
- Containment
- The U.S. strategy of stopping the spread of communism rather than attacking the USSR directly.
- Truman Doctrine (1947)
- A pledge to aid nations resisting communism, beginning with Greece and Turkey.
- Marshall Plan (1948)
- A U.S. program of economic aid to rebuild Western Europe and resist communism.
- NATO (1949)
- A military alliance of Western nations formed to counter Soviet power.
- Korean War (1950–53)
- A conflict in which the U.S. fought to contain communism on the Korean Peninsula.
- McCarthyism
- Senator Joseph McCarthy's anti-communist campaign of accusations and fear in the early 1950s.
- Brown v. Board of Education (1954)
- A ruling that struck down 'separate but equal,' declaring school segregation unconstitutional.
- Montgomery Bus Boycott (1955–56)
- A protest sparked by Rosa Parks that launched the modern civil rights movement.
- Martin Luther King Jr.
- A civil rights leader who championed nonviolent protest against segregation.
- Civil Rights Act of 1964
- A landmark law banning discrimination based on race, color, religion, sex, or national origin.
- Voting Rights Act of 1965
- A law banning racial discrimination in voting and authorizing federal oversight of elections.
- Cuban Missile Crisis (1962)
- A 13-day standoff over Soviet missiles in Cuba that brought the U.S. and USSR near nuclear war.
- Vietnam War
- A long, divisive Cold War conflict in which the U.S. fought to contain communism in Southeast Asia.
- Great Society
- Lyndon Johnson's programs to fight poverty and expand civil rights, including Medicare and Medicaid.
- Medicare and Medicaid (1965)
- Great Society programs providing health coverage for the elderly and the poor.
- Space Race
- U.S.-Soviet competition in spaceflight, culminating in the 1969 Apollo Moon landing.
- Feminism (second wave)
- A 1960s–70s movement for women's equality in work, law, and society, led by figures like Betty Friedan.
- Counterculture
- The 1960s youth movement that rejected mainstream values and protested the Vietnam War.
- Watergate
- A 1970s scandal of abuse of power that forced President Nixon to resign in 1974.
- Détente
- A 1970s easing of Cold War tensions between the U.S. and the Soviet Union.
- Stagflation
- The 1970s combination of high inflation and high unemployment that hurt the economy.
- Roe v. Wade (1973)
- A Supreme Court ruling that recognized a constitutional right to abortion (later overturned in 2022).
- Reaganomics
- The 1980s supply-side program of tax cuts, deregulation, and reduced domestic spending.
- Ronald Reagan
- The president whose 1980 election launched a conservative era and a Cold War military buildup.
- Conservative resurgence
- The rise of conservatism around 1980 emphasizing smaller government and traditional values.
- End of the Cold War
- The collapse of Soviet communism around 1989–1991, leaving the U.S. the sole superpower.
- Fall of the Berlin Wall (1989)
- A symbolic end of the Cold War division of Europe.
- Globalization
- The growing economic and cultural integration of nations through trade, technology, and migration.
- NAFTA (1994)
- A trade agreement reducing barriers among the U.S., Canada, and Mexico.
- Information technology revolution
- The late-20th-century rise of computers and the internet that transformed the economy.
- September 11, 2001
- Terrorist attacks on the U.S. that reshaped foreign policy and security debates.
- War on Terror
- The U.S. campaign after 9/11, including wars in Afghanistan and Iraq.
- Persian Gulf War (1991)
- A U.S.-led coalition war that drove Iraq out of Kuwait.
- Culture wars
- Ongoing political conflicts over social issues such as abortion, religion, and identity.
- Rising immigration
- Late-20th- and 21st-century immigration that increased the nation's diversity and shaped politics.
- Affordable Care Act (2010)
- A major health-care law expanding insurance coverage.
- Economic inequality debates
- Contemporary debates over the widening gap between rich and poor.
- Bill Clinton
- The 1990s Democratic president associated with welfare reform and economic growth.