What was the name of the 1976 national anniversary that preceded America250's 2026 observance?

The 1976 national anniversary that preceded America250’s 2026 observance was the United States Bicentennial.

The Bicentennial marked 200 years since the Declaration of Independence was adopted in 1776. Celebrations took place across the country, with commemorative events, exhibits, performances, and public projects. Philadelphia hosted major festivities because of its connection to the Declaration and the Continental Congress.

The 2026 America250 observance follows the same anniversary sequence: 1776 to 1976 was 200 years, while 1776 to 2026 is 250 years. The earlier celebration is therefore a historical predecessor, not the same event.

“Centennial” refers to 100 years, and “sesquicentennial” refers to 150 years. The United States marked its Centennial in 1876 and its Sesquicentennial in 1926 before reaching the Bicentennial.