Trans-Mississippi was a common name of the geographic area west of the Mississippi River during the 19th century. The area included Arkansas, Louisiana, Missouri, Texas, Indian Territory (now Oklahoma), and many other territories. The term "Trans-Mississippi" was historically used to refer to any land "across the Mississippi" (or the entire western two-thirds of the United States). In 1898, a Trans-Mississippi Exposition was held at Kountze Park (Omaha, Nebraska).