On April 22, 1890, the western part of the state was opened to almost 50,000 settlers for the Oklahoma Land Run. During this land run Oklahoma got its nickname, "The Sooner State". The nickname came from the settlers who crossed the territory's borders before the land was opened by the government. A year later, the western part of the territory was turned into Oklahoma territory. The northeastern part, which was home to the Five Civilized Tribes, stayed under the control of the tribes. On November 16, 1907, the western and eastern territories joined together. They became the 46th state of the United States.