What anniversary did America250 mark in 2026 for the United States Declaration of Independence?

America250 marked the 250th anniversary of the United States Declaration of Independence in 2026.

The anniversary was based on the Second Continental Congress adopting the Declaration on July 4, 1776. The United States Semiquincentennial is therefore also called the nation’s 250th anniversary or semiquincentennial.

The word semiquincentennial combines semi-, meaning half, with quincentennial, meaning a 500th anniversary. It describes 250 years, while bicentennial describes 200 years and sesquicentennial describes 150 years.

America250 was planned as a nationwide commemoration involving historical programs, public events and special collectibles. The anniversary commemorated independence as expressed through the Declaration, rather than the later ratification of the Constitution in 1788 or the start of the federal government in 1789.