Which earlier U.S. anniversary did the 2026 semiquincentennial follow by 50 years?

The 2026 semiquincentennial follows the 1976 United States Bicentennial by 50 years.

The 1976 celebration marked 200 years since the Declaration of Independence. It was a nationwide observance featuring parades, exhibitions, commemorative objects, historical programs, and specially decorated public spaces. Philadelphia, the city associated with the Declaration and the Constitutional Convention, was a major focus.

The 2026 anniversary is not the first time the United States has organized a large national commemoration. Organizers and communities can draw on the bicentennial's events and lessons while creating programs for a different generation.

Bicentennial means 200 years, while semiquincentennial means 250 years. The two celebrations are separated by half a century, not by the 100 years suggested by the word “centennial.”