Colorado is a U.S. state encompassing most of the Southern Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains. Colorado is part of the Western United States, the Southwestern United States, and the Mountain States. Wikipedia

Nebraska is a state that lies in both the Great Plains and the Midwestern United States. Its state capital is Lincoln. Its largest city is Omaha, which is on the Missouri River. Wikipedia