What are the broad grasslands which lie west of the Mississippi River and the east of the rocky Mountains that over parts of Colorado?

The broad grasslands located west of the Mississippi River and east of the Rocky Mountains are known as the Great Plains. This region extends through parts of several states, including Colorado, and is characterized by flat terrain, extensive grasslands, and a semi-arid climate. The Great Plains are significant for agriculture and ranching, playing a crucial role in the economy of the United States.