The Trans-Mississippi and International Exposition was a world's fair held in Omaha, Nebraska from June 1 to November 1 of 1898. Its goal was to showcase the development of the entire West, stretching from the Mississippi River to the Pacific Coast. The Indian Congress was held concurrently. Over 2.6 million people came to Omaha to view the 4,062 exhibits during the four months of the Exposition. President William McKinley and William Jennings Bryan were among the dignitaries who attended at the invitation of Gurdon Wattles, the event's leader. 100,000 people assembled on the plaza to hear them speak. The Expo stretch over a tract in North Omaha and featured a -long lagoon encircled by 21 classical buildings that featured fine and modern products from around the world.
Many important developments happened throughout the city before the opening of the Trans-Mississippi Exposition. They included the opening of the Burlington Train Station in downtown Omaha. The construction of the hundreds of temporary buildings at the Expo was notable because of the almost exclusive usage of a new, cheap and pliable building material called staff. It allowed Expo designers to construct visual reproductions of Grecian and Roman temples, fine European buildings, and more.
During the Expo, on August 31, 1898, the committee declared "Cody Day" in honor of Buffalo Bill Cody. Cody brought his "world-famous" Wild West Show back to the Omaha Driving Park where it was formally founded several years earlier.
The following year after the Expo some members of its managing committee decided to host another Expo-type event, which became the Great American Exposition in summer 1899.
A monument to the exposition was placed in Omaha's Kountze Park, the former site of the exposition, during a Centennial celebration of the Trans-Mississippi and International Exposition in 1998.