Which earlier U.S. anniversary was celebrated nationwide in 1976 before America250?

The United States Bicentennial was celebrated nationwide in 1976 before America250. It commemorated the 200th anniversary of the Declaration of Independence and remains the most recent comparable nationwide milestone.

The Bicentennial occurred two centuries after the 1776 founding-era events. Communities across the country organized ceremonies, exhibitions, parades, educational programs, and commemorative projects. The anniversary became one of the largest coordinated historical celebrations in U.S. history.

America250 follows the same anniversary sequence 50 years later. The 1976 Bicentennial marked 200 years, while the 2026 Semiquincentennial marks 250 years. The names differ because “bi” means two hundred and “semiquin” refers to half of five hundred.

The term is sometimes mistakenly applied to the 1876 Centennial or the 1926 Sesquicentennial. Those events marked 100 and 150 years, respectively. In the sequence of major national observances, 1976 is specifically the Bicentennial.