Which earlier national celebration does the United States Semiquincentennial follow?

The United States Semiquincentennial follows the United States Bicentennial.

The Bicentennial culminated on July 4, 1976, exactly 200 years after the Second Continental Congress adopted the Declaration of Independence. It was a nationwide series of commemorations focused on the American Revolution and the nation’s founding.

The 1976 celebration was organized through federal bodies including the American Revolution Bicentennial Commission and the American Revolution Bicentennial Administration. It included exhibitions, ceremonies, parades, and other public events.

The two anniversaries are separated by 50 years: 1976 marked 200 years, while 2026 marks 250. The next comparable milestone after America250 will be the United States Tricentennial in 2076.