What Philadelphia world's fair celebrated the United States’ centennial in 1876, a predecessor to America250?

The Centennial Exposition was the Philadelphia world's fair that celebrated the United States’ centennial in 1876, a predecessor to America250.

Officially called the International Exhibition of Arts, Manufactures and Products of the Soil and Mine, the exposition opened in Philadelphia's Fairmount Park. It marked 100 years since the Declaration of Independence and displayed industrial products, machinery, art, and agricultural achievements.

The event helped present the United States as an industrial and technological power. Visitors encountered such innovations and exhibits as Alexander Graham Bell's telephone demonstration, Corliss steam engines, and products from across the United States and other participating countries.

Philadelphia was especially appropriate because the Declaration had been adopted there in 1776. The city's later anniversary events included the 1926 Sesquicentennial Exposition, while the 1976 Bicentennial and 2026 America250 observances continued the pattern of national commemorations.