Trans-Mississippi

Trans-Mississippi was a common name of the geographic area west of the Mississippi River during the 19th century.

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), including Nebraska, Iowa, North Dakota, South Dakota, Kansas, Minnesota, Arkansas, Louisiana, Missouri, Texas, New Mexico, Arizona, California, Nevada, Colorado, Montana, Idaho, Washington and Oregon.

[1][2] In 1898, a Trans-Mississippi Exposition was held in Omaha, Nebraska.

The postage stamps of the Trans-Mississippi Exposition Issue are considered some of the most beautiful stamps ever issued by the United States, and a complete set of the "Trans-Miss" has been highly prized since its 1898 issue.

[3] Demonstrating the ongoing significance of the event and its focus, on its 100th anniversary in 1998, a set of stamps using designs derived from the original issue was issued to commemorate its 100th anniversary.