The Colonial Revival gardening movement traces its origins to the Centennial International Exhibition of 1876, the first official World's Fair held in the United States. The Centennial Exposition was held in Philadelphia, Pennsylvania, from May 10 to November 10, 1876, and it celebrated the 100th anniversary of the signing of the Declaration of Independence. Although the Colonial Revival gardening movement had already begun a short time before, the Centennial Exposition created intense interest in all things colonial — including the colonial garden.