What was the name of the United States' previous nationwide 100-year milestone celebration before America250?

The United States' previous nationwide 100-year milestone celebration before America250 was the United States Bicentennial.

The Bicentennial commemorated the 200th anniversary of the Declaration of Independence and was centered on 1976. It generated nationwide ceremonies, exhibitions, public works, special stamps, commemorative coins, and a broad red-white-and-blue visual identity. The celebration helped establish the pattern of marking major national anniversaries through coordinated federal, state, and local programs.

The 1976 event is sometimes called the American Revolution Bicentennial because it focused on the nation's revolutionary founding. It was not the 200th anniversary of the Constitution, the Civil War, or the beginning of the federal government. America250 follows the same 1776 anniversary sequence: 1976 marked 200 years, while 2026 marks 250.