The United States Semiquincentennial, known as America250, takes place in 2026.
A semiquincentennial marks a 250th anniversary. America250 commemorates the 250th anniversary of the 1776 adoption of the Declaration of Independence, making 2026 the relevant anniversary year. The celebration follows the United States Bicentennial in 1976, which marked the same event's 200th anniversary.
The word “semiquincentennial” combines “semi,” meaning half, with “quincentennial,” meaning a 500th anniversary. It therefore means 250 years, rather than 150 or 300. America250 is the shorter public-facing name used for the national commemoration.
The anniversary centers on the founding era, but the United States was not created by one event alone. The Declaration was adopted in 1776, while the Articles of Confederation and the Constitution established later frameworks for national government.