The lands that now form the United States have been inhabited for thousands of years by Indigenous peoples with diverse languages, governments, economies, and spiritual traditions. These include, among many others, the Haudenosaunee, Cherokee, Navajo, Lakota, Apache, Pueblo peoples, Choctaw, Inuit, Yupik, Tlingit, and many nations across the Pacific, Great Plains, Eastern Woodlands, Southwest, and Arctic regions.
European colonization began in the 16th century and accelerated in the 17th century with Spanish, French, Dutch, and especially British settlements. The British colonies along the Atlantic seaboard developed local assemblies and commercial economies but remained part of the British Empire. Tensions over taxation, representation, and imperial control helped trigger the American Revolution. The Declaration of Independence was adopted in 1776, and the United States secured independence after the Revolutionary War, formally recognized by the Treaty of Paris in 1783.
The Constitution created the modern federal government framework in 1787, with George Washington becoming the first president in 1789. Early national history included territorial expansion, conflict with Native nations, and deepening political conflict over slavery. The Louisiana Purchase in 1803 doubled the country's size. Westward expansion, often described historically as Manifest Destiny, brought settlement, displacement, forced removal of Indigenous peoples, and war with Mexico, after which the U.S. gained large southwestern territories.
The contradiction between democratic language and slavery became central to national politics. The Civil War (1861-1865) erupted after the secession of Southern slaveholding states. Union victory preserved the country and led to the abolition of slavery through the 13th Amendment. Reconstruction briefly expanded political rights for formerly enslaved people, but white supremacist violence and later Jim Crow laws imposed segregation and disenfranchisement across much of the South.
In the late 19th and early 20th centuries, the U.S. industrialized rapidly. Railroads, steel, manufacturing, oil, finance, and mass immigration transformed the economy and cities. Labor struggles, reform movements, and the Progressive Era reshaped public life. The U.S. emerged as a major global power after the Spanish-American War and played decisive roles in both World War I and World War II.
The mid-20th century was marked by the Great Depression, the New Deal, wartime mobilization, suburbanization, the Cold War, and the Civil Rights Movement. Landmark federal legislation in the 1960s challenged legal segregation and protected voting rights. Immigration reforms in 1965 changed the country's demographic patterns, increasing migration from Asia, Latin America, Africa, and the Caribbean.
Recent decades have included deindustrialization in some regions, growth in technology and finance, expanded higher education, and ongoing political realignment. Major events include the end of the Cold War, the September 11, 2001 attacks, wars in Afghanistan and Iraq, the 2008 financial crisis, intensified polarization, the COVID-19 pandemic, and renewed public debates over race, democracy, inequality, climate, and national identity.