Philadelphia hosted the 1876 Centennial Exposition, the first official world's fair held in the United States.
The exposition took place in Fairmount Park from May 10 to November 10, 1876. Its official name was the International Exhibition of Arts, Manufactures, and Products of the Soil and Mine. The event marked the 100th anniversary of the adoption of the Declaration of Independence, which had also occurred in Philadelphia.
The fair presented American industrial achievements alongside exhibits from 37 countries. Nearly 10 million visitors attended, an extraordinary figure for the era. Memorial Hall was among its major buildings, and displays included technologies such as the telephone, sewing machine, and typewriter.
The Centennial Exposition is sometimes confused with later Philadelphia celebrations, including the 1926 Sesquicentennial Exposition. The 1876 event was the nation's centennial celebration and helped establish the United States as a major participant in international world's fairs.