What is the next 100-year U.S. anniversary after the 2026 Semiquincentennial?

The Tricentennial is the next 100-year U.S. anniversary after the 2026 Semiquincentennial.

A tricentennial marks 300 years, so the next one after the 250th anniversary in 2026 will occur in 2076. It will commemorate the 300th anniversary of the Declaration of Independence and the founding-era events associated with 1776.

The name comes from the Latin prefix tri-, meaning three, combined with centennial, meaning a 100-year anniversary. The term is therefore different from semiquincentennial, which denotes 250 years.

Several other anniversary terms can cause confusion. A centennial is 100 years, a sesquicentennial is 150 years, and a bicentennial is 200 years. The 2026 observance is also called the Quarter Millennium because 250 years equals one quarter of a millennium.