In America250’s official terminology, what is the 250th anniversary of U.S. independence called?

America250’s 250th-anniversary observance is called the United States Semiquincentennial.

“Semiquincentennial” combines roots meaning half of five centuries, or 250 years. The term describes the national anniversary associated with July 4, 2026, commemorating the 250th anniversary of American independence.

The celebration is also known by less common names, including sestercentennial and quarter millennium. “Bicentennial” refers to the 200th anniversary celebrated in 1976, while “centennial” means a 100th anniversary. These terms are sometimes confused because each marks a major national milestone.

The United States Semiquincentennial Commission was created by Congress in 2016 to plan the commemoration. America250 is the public-facing initiative connected with the nationwide celebration and its educational, cultural, and civic programs.