The U.S. anniversary scheduled to follow the 2026 Semiquincentennial is the Tricentennial in 2076.
A tricentennial marks 300 years. Since the United States’ Semiquincentennial marks 250 years in 2026, adding another 50 years leads to the nation’s 300th anniversary in 2076. The word comes from “tri,” meaning three, and “centennial,” referring to centuries.
The sequence of milestone names can be confusing. The Centennial was the 100th anniversary in 1876, the Sesquicentennial was the 150th in 1926, and the Bicentennial was the 200th in 1976. The Semiquincentennial is the 250th in 2026, followed by the Tricentennial at 300 years.
The 2076 anniversary is listed as the next major U.S. anniversary after America250. It is also exactly 300 years after the Declaration of Independence was adopted in 1776. Although future celebrations may change in form, the calendar arithmetic fixes the anniversary year.