The land that became the United States has been home to Indigenous societies for tens of thousands of years, including sophisticated mound-building, pueblo, trading, and political cultures. European colonization began with Spanish, Dutch, Swedish, French, and English settlements, bringing new crops and animals but also devastating Indigenous populations through disease, warfare, and displacement. The Thirteen Colonies rebelled against British taxation and became an independent republic in 1783. Expansion brought new territory—and intensified conflict over slavery. The Civil War preserved the Union and abolished slavery, but Reconstruction’s collapse enabled segregation and disenfranchisement. Industrialization, immigration, reform, and women’s suffrage transformed society. The United States then became a global power through two world wars and the Cold War. In the contemporary era, economic crises, terrorism, racial justice movements, polarization, and renewed space ambitions continue reshaping the nation.