The United States will reach its next 300th anniversary after America250 in 2076. That future milestone will be the nation’s tricentennial, counting 300 years from 1776.
The sequence is straightforward: the Declaration of Independence is associated with 1776, the bicentennial occurred in 1976, the semiquincentennial occurs in 2026, and the tricentennial will fall in 2076. Each milestone adds another 50 or 100 years to the anniversary timeline.
The 2076 date is a calendar calculation rather than a prediction about a particular event schedule. Governments, museums, and communities may eventually plan celebrations for it, just as they planned earlier national anniversaries. America250 therefore sits between the 1976 bicentennial and the much more distant 2076 tricentennial.