The United States will celebrate its 300th anniversary in 2076, one century after the 1976 Bicentennial and 50 years after America250.
The anniversary sequence follows the date associated with the Declaration of Independence: 1776 was the founding year used for the Bicentennial, 2026 marks 250 years, and 2076 will mark 300 years. A 300th anniversary is commonly called a tricentennial.
The 2076 milestone will also fall on July 4, assuming the nation continues to observe its anniversary on Independence Day. It is expected to be a major future historical reference point, although its specific events and programs are not yet fixed.
This question can be confused with the 300th anniversary of another American institution, such as the Constitution or a state. Those anniversaries have different dates. The year 2076 specifically follows the 1776 independence chronology used by America250.