The bicentennial is America250’s immediate predecessor among the listed U.S. anniversaries.
A bicentennial marks 200 years, and the United States celebrated its bicentennial in 1976. America250 marks 250 years in 2026, so it follows the bicentennial by 50 years rather than by another full century.
A centennial marks 100 years and would refer to the 1876 milestone. A tricentennial marks 300 years and would fall in 2076. A quincentennial marks 500 years, which would be far later than the semiquincentennial.
The terms describe elapsed time, not the number of people, states, or documents involved. In this context, all of the calculations use 1776 as the starting point associated with the Declaration of Independence.