Page "Wyoming Territory" Paragraph 1

Because of Wyoming's location at the intersection of the Louisiana Purchase, the Oregon Country, and the Mexican Cession, the land which became Wyoming has a complicated history of territorial relationships.

Portions of the territory which eventually fell under Wyoming's jurisdiction were at various points associated with Washington, Oregon, Idaho, Dakota, Nebraska and Utah, and had previously belonged to the independent states of Great Britain, France, Spain, Mexico, and Texas.