March 2, 1861, saw the creation of the Dakota Territory. It was made of all of the portions of Nebraska Territory north of 43° N (the present-day Nebraska–South Dakota border), along with the portion of present-day Nebraska between 43° N and the Keya Paha and Niobrara rivers (this land would be returned to Nebraska in 1882). The act creating the Dakota Territory also included provisions granting Nebraska small portions of Utah Territory and Washington Territory—present-day southwestern Wyoming bounded by 41° N, 110°03′ W (33° W of Washington, D.C.), 43° N, and the Continental Divide. These portions had not been part of the Louisiana Purchase; rather, they had been part of Oregon Country and became part of the United States in 1846.