The Centennial International Exhibition, officially the International Exhibition of Arts, Manufactures, and Products of the Soil and Mine, was held in Philadelphia from May 10 to November 10, 1876. It was the first official world's fair to be held in the United States, and coincided with the centennial anniversary of the Declaration of Independence's adoption in Philadelphia on July 4, 1776.
An illustration of opening day ceremonies at the Centennial Exposition in Philadelphia on May 10, 1876