Which 1876 Philadelphia event commemorated the 100th anniversary that America250 follows?

The Centennial Exposition was the 1876 Philadelphia event that commemorated the 100th anniversary of American independence, a milestone America250 follows 150 years later.

Officially called the International Exhibition of Arts, Manufactures and Products of the Soil and Mine, the exposition opened in Philadelphia’s Fairmount Park. It showcased industrial machinery, manufactured goods, art, agricultural products, and exhibits from the United States and other countries.

The exposition helped turn the centennial into an international display of American achievements. Several surviving structures, including Memorial Hall, remain associated with the event. It should not be confused with the 1893 World’s Columbian Exposition in Chicago or the 1904 Louisiana Purchase Exposition in St. Louis; those later world’s fairs commemorated different historical milestones.