The United States observed its 250th anniversary on July 4, 2026, during the America250 celebration.
The date marks 250 years since the Second Continental Congress adopted the Declaration of Independence on July 4, 1776. The anniversary is known as the United States Semiquincentennial, using a term for a 250-year milestone. America250 is the national commemoration associated with this historic date.
The anniversary date can be confused with other important milestones. The Declaration was primarily signed on August 2, 1776, although Congress adopted it on July 4. The U.S. Army also marked its own 250th anniversary on June 14, 2025, because the Continental Congress established the Army in 1775. America250 therefore centers on July 4, 2026, rather than either of those dates.