- Declaration of Independence
- The 1776 document, drafted mainly by Thomas Jefferson, that announced the thirteen colonies' separation from Britain and asserted the unalienable rights of life, liberty, and the pursuit of happiness.
- Unalienable rights
- Rights that cannot be taken away or given up — named in the Declaration of Independence as life, liberty, and the pursuit of happiness.
- U.S. Constitution
- The supreme law of the United States, ratified in 1788, that establishes the framework of the federal government and the limits of its power.
- Preamble
- The opening statement of the Constitution beginning 'We the People,' which sets out the document's purposes, such as to 'form a more perfect Union' and 'promote the general Welfare.'
- Bill of Rights
- The first ten amendments to the Constitution, ratified in 1791, that guarantee individual liberties such as freedom of speech, religion, and the press.
- First Amendment
- Protects five freedoms: religion, speech, press, assembly, and petition of the government.
- Articles of Confederation
- The first U.S. government framework (1781), which created a weak central government with no power to tax and was replaced by the Constitution.
- Separation of powers
- The division of government into three branches — legislative, executive, and judicial — so that no single branch holds all power.
- Legislative branch
- Congress — the Senate and the House of Representatives — which makes federal laws, declares war, and controls spending.
- Executive branch
- Headed by the President, it carries out and enforces federal laws and includes the Cabinet and federal agencies.
- Judicial branch
- The federal court system, led by the Supreme Court, which interprets laws and decides whether they are constitutional.
- Checks and balances
- The system that lets each branch of government limit the others — for example, the President can veto laws and the Senate confirms appointments.
- Federalism
- The sharing of power between a national (federal) government and state governments.
- Veto
- The President's power to reject a bill passed by Congress; Congress can override a veto with a two-thirds vote in both houses.
- Congress
- The bicameral federal legislature, made up of the Senate (two per state) and the House of Representatives (apportioned by population).
- Senate
- The upper house of Congress with two members from each state, regardless of population, serving six-year terms.
- House of Representatives
- The lower house of Congress whose 435 seats are apportioned among the states by population, with members serving two-year terms.
- Supreme Court
- The highest federal court, which has final authority to interpret the Constitution; its justices are appointed for life.
- Judicial review
- The power of courts to declare laws or government actions unconstitutional, established in Marbury v. Madison (1803).
- Amendment process
- Changing the Constitution typically requires a two-thirds vote of both houses of Congress and ratification by three-fourths of the states.
- Naturalization
- The legal process by which an immigrant becomes a U.S. citizen, including residency, a civics test, and an oath of allegiance.
- Citizenship by birthright
- U.S. citizenship granted to anyone born on U.S. soil, guaranteed by the Fourteenth Amendment.
- Responsibilities of citizens
- Duties such as obeying laws, paying taxes, serving on juries, and registering for selective service; voting is a right and civic duty.
- Suffrage
- The right to vote; expanded over time by the 15th (race), 19th (women), 24th (no poll tax), and 26th (age 18) Amendments.
- Electoral College
- The body that formally elects the President; each state's electors equal its number of senators plus representatives.
- Political party
- An organized group that seeks to win elections and control government; the two major U.S. parties are the Democrats and Republicans.
- Rule of law
- The principle that everyone, including leaders, is subject to and accountable under the law.
- Popular sovereignty
- The idea that government's authority comes from the consent of the people.
- Limited government
- The principle that government power is restricted by law, usually through a written constitution.
- Colonial era
- The period (1607–1776) when thirteen British colonies were established along the Atlantic coast of North America.
- Jamestown
- Founded in 1607 in Virginia, the first permanent English settlement in North America.
- Plymouth Colony
- Settled in 1620 by the Pilgrims, who signed the Mayflower Compact, an early agreement on self-government.
- Mayflower Compact
- The 1620 agreement by Pilgrims to govern themselves by majority rule — an early model of self-government.
- Triangular trade
- The colonial-era trade network linking the Americas, Europe, and Africa that exchanged goods, raw materials, and enslaved people.
- American Revolution
- The 1775–1783 war in which the thirteen colonies won independence from Great Britain.
- Boston Tea Party
- A 1773 protest in which colonists dumped British tea into Boston Harbor to oppose taxation without representation.
- 'No taxation without representation'
- The colonial slogan protesting British taxes imposed without colonial representation in Parliament.
- George Washington
- Commander of the Continental Army and the first President of the United States.
- Thomas Jefferson
- Principal author of the Declaration of Independence and the third President of the United States.
- Treaty of Paris (1783)
- The treaty that ended the American Revolution and recognized U.S. independence from Britain.
- Louisiana Purchase
- The 1803 acquisition from France that doubled the size of the United States.
- Manifest Destiny
- The 19th-century belief that the United States was destined to expand across the continent to the Pacific.
- Westward expansion
- The 1800s movement of settlers across the continent, aided by the Oregon Trail and the transcontinental railroad.
- Trail of Tears
- The forced 1830s removal of Cherokee and other Native nations from the Southeast, during which thousands died.
- Industrial Revolution (U.S.)
- The shift to factory-based manufacturing in the 1800s that transformed the U.S. economy and spurred urban growth.
- Abolitionism
- The movement to end slavery, led by figures such as Frederick Douglass and Harriet Tubman.
- Civil War
- The 1861–1865 war between the Union (North) and the Confederacy (South), fought largely over slavery and states' rights.
- Emancipation Proclamation
- Lincoln's 1863 order declaring enslaved people in Confederate states to be free.
- Abraham Lincoln
- President during the Civil War who preserved the Union and issued the Emancipation Proclamation.
- Reconstruction
- The 1865–1877 period of rebuilding the South and integrating formerly enslaved people, including the 13th, 14th, and 15th Amendments.
- Thirteenth Amendment
- The 1865 amendment that abolished slavery in the United States.
- Fourteenth Amendment
- The 1868 amendment granting citizenship and equal protection of the laws to all persons born in the U.S.
- Fifteenth Amendment
- The 1870 amendment prohibiting denial of the vote based on race.
- Jim Crow laws
- State and local laws enforcing racial segregation in the South from Reconstruction until the mid-20th century.
- Immigration (late 1800s–early 1900s)
- A wave of newcomers, many entering through Ellis Island, who supplied labor for industry and reshaped U.S. cities.
- Progressive Era
- An early-1900s reform movement that fought corruption and improved labor, food, and political conditions.
- Nineteenth Amendment
- The 1920 amendment that guaranteed women the right to vote.
- World War I (U.S. role)
- The U.S. entered in 1917, helping the Allies win and emerging as a world power.
- Great Depression
- The severe economic downturn beginning with the 1929 stock market crash, causing mass unemployment in the 1930s.
- New Deal
- President Franklin Roosevelt's 1930s programs to provide relief, recovery, and reform during the Great Depression.
- Franklin D. Roosevelt
- President during the Great Depression and most of World War II, known for the New Deal.
- World War II (U.S. role)
- The U.S. entered after Pearl Harbor (1941), helping defeat the Axis powers by 1945.
- Pearl Harbor
- The 1941 Japanese attack on a U.S. naval base in Hawaii that brought the United States into World War II.
- Cold War
- The post-WWII rivalry (roughly 1947–1991) between the United States and the Soviet Union over political and economic systems.
- Civil Rights Movement
- The 1950s–1960s struggle to end racial segregation and secure equal rights for Black Americans.
- Martin Luther King Jr.
- A leader of the Civil Rights Movement who advocated nonviolent protest and delivered the 'I Have a Dream' speech (1963).
- Civil Rights Act of 1964
- Landmark law that outlawed discrimination based on race, color, religion, sex, or national origin.
- Brown v. Board of Education
- The 1954 Supreme Court decision that declared racial segregation in public schools unconstitutional.
- Rosa Parks
- Civil-rights activist whose 1955 refusal to give up her bus seat sparked the Montgomery Bus Boycott.
- Voting Rights Act of 1965
- Federal law that banned discriminatory voting practices such as literacy tests.
- Three-Fifths Compromise
- The constitutional agreement counting three-fifths of a state's enslaved population for representation and taxation.
- Great Compromise
- The 1787 agreement creating a bicameral Congress: equal Senate representation and population-based House representation.
- Federalist Papers
- Essays by Hamilton, Madison, and Jay arguing for ratification of the Constitution.
- Anti-Federalists
- Opponents of the Constitution who feared a strong central government and pushed for a Bill of Rights.
- Due process
- The constitutional guarantee that the government must follow fair legal procedures before depriving a person of life, liberty, or property.
- Equal protection
- The Fourteenth Amendment guarantee that states must treat people equally under the law.
- Habeas corpus
- A legal protection requiring that a detained person be brought before a court to determine whether the detention is lawful.
- Constitutional Convention
- The 1787 Philadelphia meeting where delegates drafted the U.S. Constitution.
- Cabinet
- The group of department heads who advise the President and lead the executive agencies.
- Impeachment
- The constitutional process by which the House charges, and the Senate tries, a federal official for serious misconduct.
- Sectionalism
- Loyalty to the interests of one region over the nation, a key tension between North and South before the Civil War.
- States' rights
- The idea that states retain powers not delegated to the federal government, a major issue leading to the Civil War.
- Monroe Doctrine
- The 1823 policy warning European powers against new colonization or interference in the Americas.
- Transcontinental Railroad
- Completed in 1869, it linked the eastern and western United States and accelerated settlement and trade.
- Suffrage movement
- The decades-long campaign, led by activists such as Susan B. Anthony, that won women the right to vote in 1920.
- Frederick Douglass
- A formerly enslaved man who became a leading abolitionist writer and speaker.
- Harriet Tubman
- An escaped enslaved woman who guided others to freedom via the Underground Railroad.
- Underground Railroad
- A secret network of routes and safe houses that helped enslaved people escape to free states and Canada.
- Bicameral legislature
- A lawmaking body with two chambers; the U.S. Congress has the Senate and the House of Representatives.
- Civic participation
- Ways citizens take part in government, such as voting, volunteering, contacting officials, and serving on juries.
- Latitude
- Imaginary horizontal lines that measure distance north or south of the equator, expressed in degrees.
- Longitude
- Imaginary vertical lines that measure distance east or west of the prime meridian, expressed in degrees.
- Equator
- The line of 0° latitude that divides Earth into the Northern and Southern Hemispheres.
- Prime Meridian
- The line of 0° longitude, running through Greenwich, England, that divides Earth into Eastern and Western Hemispheres.
- Map legend (key)
- The part of a map that explains what its symbols, colors, and lines represent.
- Compass rose
- A map symbol showing the cardinal directions — north, south, east, and west.
- Map scale
- The ratio that relates distance on a map to actual distance on the ground.
- Cardinal directions
- The four main points of a compass: north, south, east, and west.
- Intermediate directions
- The points between the cardinal directions: northeast, northwest, southeast, and southwest.
- Physical map
- A map that shows natural features such as mountains, rivers, and elevation.
- Political map
- A map that shows human-made boundaries such as countries, states, and cities.
- Hemisphere
- Half of Earth — Northern/Southern divided by the equator, or Eastern/Western divided by the prime meridian.
- Continent
- One of Earth's seven large landmasses: Africa, Antarctica, Asia, Australia, Europe, North America, and South America.
- Landform
- A natural feature of Earth's surface, such as a mountain, plateau, valley, plain, or peninsula.
- Peninsula
- A piece of land nearly surrounded by water but connected to a larger landmass.
- Plateau
- A flat, elevated landform that rises sharply above the surrounding area.
- Plain
- A large area of flat or gently rolling land, often used for farming.
- Delta
- A fan-shaped deposit of sediment formed where a river empties into a larger body of water.
- Tributary
- A smaller stream or river that flows into a larger one.
- Climate
- The typical pattern of temperature and precipitation in a region over a long period of time.
- Weather vs. climate
- Weather is the day-to-day state of the atmosphere; climate is the long-term average of weather in a place.
- Region
- An area defined by shared characteristics, such as climate, landforms, language, or economy.
- Natural resources
- Materials from nature that people use, such as water, timber, minerals, and fossil fuels.
- Renewable resource
- A resource that can be replenished naturally over a short time, such as sunlight, wind, or water.
- Nonrenewable resource
- A resource that exists in limited supply and is not replaced quickly, such as coal, oil, or natural gas.
- Human-environment interaction
- The ways people adapt to, depend on, and modify their physical surroundings.
- Adaptation (to environment)
- How people adjust their behavior or technology to live in a particular environment, such as building irrigation in dry regions.
- Migration
- The movement of people from one place to another to live, often driven by jobs, climate, or conflict.
- Push and pull factors
- Reasons people migrate: push factors drive people away (war, famine); pull factors attract them (jobs, safety).
- Urbanization
- The growth of cities as people move from rural areas to urban centers.
- Population density
- The number of people living in a given area, usually expressed as people per square mile or kilometer.
- Five themes of geography
- Location, place, human-environment interaction, movement, and region — a framework for studying geography.
- Absolute location
- The exact position of a place, given by its latitude and longitude coordinates.
- Relative location
- Where a place is in relation to other places, such as 'north of the river.'
- Globe
- A three-dimensional model of Earth that shows its true shape, sizes, and distances more accurately than a flat map.
- Map projection
- A method of showing the round Earth on a flat map, which always distorts size, shape, or distance.
- Time zone
- A region of Earth that shares the same standard time, based on lines of longitude.
- Anthropology
- The study of human cultures, societies, and their development over time.
- Culture
- The shared beliefs, customs, values, language, and ways of life of a group of people.
- Cultural diffusion
- The spread of cultural ideas, goods, and practices from one group or region to another.
- Artifact
- An object made or used by people in the past that helps us learn about their culture.
- Tradition
- A custom or belief passed down through generations within a culture.
- Ethnicity
- A shared cultural identity based on common ancestry, language, religion, or nationality.
- Sociology
- The study of human society, social groups, and how people interact within them.
- Socialization
- The lifelong process by which people learn the norms, values, and behaviors of their society.
- Social institution
- An established structure that meets a society's needs, such as the family, school, government, or religion.
- Norms
- The shared rules and expectations that guide behavior within a society.
- Values (sociology)
- The ideas a society holds about what is good, right, and desirable.
- Social group
- Two or more people who interact and share a sense of belonging, such as a family or team.
- Community
- A group of people who live in the same area or share common interests and institutions.
- Role (social)
- The expected behavior that comes with a person's position in society, such as parent, student, or worker.
- Demography
- The statistical study of human populations, including size, growth, and distribution.
- Geographic Information System (GIS)
- Computer technology that stores, maps, and analyzes geographic data.
- Topographic map
- A map that uses contour lines to show the elevation and shape of the land.
- Climate zones
- Broad regions defined by typical temperature and precipitation, such as tropical, temperate, and polar.
- Ecosystem
- A community of living things interacting with one another and their physical environment.
- Conservation
- The careful use and protection of natural resources to prevent waste or depletion.
- Erosion
- The gradual wearing away and movement of soil and rock by wind, water, or ice.
- Cultural region
- An area where people share common cultural traits such as language, religion, or way of life.
- Indigenous peoples
- The original inhabitants of a region, whose cultures developed there before later settlers arrived.
- Mesopotamia
- An ancient civilization between the Tigris and Euphrates rivers, often called the 'cradle of civilization.'
- Fertile Crescent
- A region of rich farmland in the Middle East where some of the earliest civilizations arose.
- Ancient Egypt
- A civilization along the Nile River known for pharaohs, pyramids, and hieroglyphic writing.
- Nile River
- The river whose annual floods made farming possible and sustained ancient Egyptian civilization.
- Hieroglyphics
- The ancient Egyptian writing system that used pictures and symbols to represent sounds and ideas.
- Ancient Greece
- A civilization known for democracy, philosophy, and the arts, centered on city-states like Athens and Sparta.
- Athenian democracy
- An early form of direct democracy in ancient Athens in which male citizens voted on laws.
- Ancient Rome
- A civilization that grew from a republic into an empire and influenced law, government, and engineering.
- Roman Republic
- Rome's government before the empire, in which elected senators and officials shared power.
- Ancient China
- A civilization that developed along the Huang He (Yellow River) and produced inventions such as paper and the compass.
- Silk Road
- A network of trade routes connecting China to the Middle East and Europe, spreading goods and ideas.
- Middle Ages
- The period in Europe (roughly 500–1500 CE) marked by feudalism, the power of the Church, and limited trade.
- Feudalism
- The medieval system in which lords granted land to vassals in exchange for military service and loyalty.
- Renaissance
- A 14th–17th-century European rebirth of art, learning, and science that revived classical ideas.
- Printing press
- Gutenberg's 15th-century invention that allowed books to be mass-produced and spread knowledge widely.
- Age of Exploration
- The 15th–17th-century period when European nations explored and colonized distant lands by sea.
- Columbian Exchange
- The transfer of plants, animals, people, and diseases between the Americas and the rest of the world after 1492.
- Christopher Columbus
- The explorer whose 1492 voyage opened lasting contact between Europe and the Americas.
- Industrial Revolution
- The shift, beginning in Britain in the late 1700s, from hand production to machine and factory manufacturing.
- World War I
- A global war (1914–1918) fought largely in Europe between the Allied and Central Powers.
- World War II
- A global war (1939–1945) between the Allied and Axis powers, the deadliest conflict in history.
- United Nations
- An international organization founded in 1945 to promote peace, security, and cooperation among nations.
- Economics
- The study of how people produce, distribute, and consume goods and services with limited resources.
- Scarcity
- The basic economic problem that resources are limited while people's wants are unlimited.
- Opportunity cost
- The value of the next-best alternative given up when a choice is made.
- Supply
- The amount of a good or service that producers are willing to offer at various prices.
- Demand
- The amount of a good or service that consumers are willing to buy at various prices.
- Law of supply and demand
- Prices tend to rise when demand exceeds supply and fall when supply exceeds demand.
- Equilibrium price
- The price at which the quantity supplied equals the quantity demanded.
- Goods and services
- Goods are physical products you can touch; services are activities people perform for others.
- Producers and consumers
- Producers make goods and services; consumers buy and use them.
- Market economy
- An economic system in which prices and production are driven by supply, demand, and private decisions.
- Command economy
- An economic system in which the government controls what is produced and at what price.
- Mixed economy
- An economic system that combines free markets with some government regulation, as in the United States.
- Money
- A medium of exchange that people accept in trade; it also serves as a store of value and a unit of account.
- Barter
- Trading goods or services directly for other goods or services without using money.
- Trade
- The exchange of goods and services between people, businesses, or nations.
- Imports and exports
- Imports are goods bought from other countries; exports are goods sold to other countries.
- Tariff
- A tax placed on imported goods, often to protect domestic producers or raise revenue.
- Specialization
- Focusing on producing a limited range of goods or services to increase efficiency and encourage trade.
- Division of labor
- Breaking a job into separate tasks done by different workers to raise productivity.
- Profit
- The money a business has left after subtracting its costs from its revenue.
- Entrepreneur
- A person who starts and runs a business, taking on risk in hopes of earning a profit.
- Factors of production
- The resources used to make goods and services: land, labor, capital, and entrepreneurship.
- Capital (economic)
- The tools, machines, and buildings used to produce goods and services.
- Wants vs. needs
- Needs are things required to live, such as food and shelter; wants are things people desire but can live without.
- Inflation
- A general rise in prices over time that reduces the purchasing power of money.
- Interdependence (economic)
- The reliance of people and nations on one another for goods, services, and resources through trade.
- Competition (market)
- Rivalry among sellers for customers, which tends to lower prices and improve quality.
- Civilization
- A complex society with cities, organized government, specialized jobs, writing, and shared culture.