How many visitors attended Philadelphia's 1876 Centennial Exposition?

Philadelphia's 1876 Centennial Exposition attracted nearly 10 million visitors.

The international fair opened on May 10, 1876, and closed on November 10, occupying a large section of Fairmount Park. It was organized to celebrate the centennial of the Declaration of Independence and to demonstrate American industrial and cultural achievement to an international audience.

Visitors saw major exhibition buildings devoted to machinery, agriculture, horticulture, and art. Displays included Alexander Graham Bell's telephone, Thomas Edison's automatic telegraph system, sewing machines, typewriters, farm equipment, and manufactured goods from the United States and other nations.

The attendance figure is often described as nearly 10 million rather than as an exact total because historical summaries round the number. The exposition hosted exhibits from 37 countries and was the first official world's fair held in the United States. Its success helped establish Philadelphia as a major center for national commemorative events.