Thirty-seven countries participated in the 1876 Centennial Exposition, a predecessor to America250 celebrations.
Held in Philadelphia’s Fairmount Park, the exposition combined a United States centennial observance with an international showcase. Foreign participants displayed manufactured goods, artwork, scientific equipment, agricultural products, and cultural objects alongside American exhibits.
The event was designed to demonstrate the country’s industrial and technological growth after its first century. Alexander Graham Bell’s telephone, Thomas Edison’s automatic telegraph system, sewing machines, agricultural equipment, and other innovations appeared among the displays.
The participation figure is distinct from the exposition’s attendance figure. Nearly 10 million visitors came to the fair, while 37 countries contributed national or international exhibits. That international presence helped make the Philadelphia event more than a domestic birthday celebration and established a useful historical comparison for America250.