The United States Semiquincentennial commemorated the 250th anniversary of independence on July 4, 2026.
The anniversary counts from July 4, 1776, when the Second Continental Congress adopted the Declaration of Independence. The date is therefore tied to the Declaration rather than to the later adoption of the Constitution or the end of the Revolutionary War.
The celebration is also called America250. “Semiquincentennial” means a 250th anniversary, although other names such as “quarter millennium” have also appeared. The previous major national anniversary was the bicentennial in 1976, marking 200 years.
July 4 is commonly called Independence Day in the United States. The 2026 observance marked 250 years since the colonies formally announced their separation from Great Britain.