The Louisiana Purchase Exposition, informally known as the Saint Louis World's Fair, was an international exposition held in St. Louis, Missouri

St. Louis, Missouri

St. Louis is an independent city on the eastern border of Missouri, United States. With a population of 319,294, it was the 58th-largest U.S. city at the 2010 U.S. Census. The Greater St...

, United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 in 1904.
In 1904, St. Louis hosted a major international World's Fair. The Fair celebrated the centennial of the Louisiana Purchase

Louisiana Purchase

The Louisiana Purchase was the acquisition by the United States of America of of France's claim to the territory of Louisiana in 1803. The U.S...

 (1803), one year late. It was delayed from a planned opening in 1903 to 1904, to allow for full-scale participation by more states and foreign countries.