Which region, encompassing states like Montana and Texas, lies between the Mississippi River and the Rocky Mountains?

The Great Plains is the correct answer because this region is characterized by its vast flatlands, which stretch between the Mississippi River to the east and the Rocky Mountains to the west. It includes states such as Montana, Texas, and others, and is known for its agricultural significance, particularly in wheat and cattle production.

The Great Plains are distinguished by their grasslands and relatively low rainfall, making them suitable for certain types of farming, especially the cultivation of crops that thrive in drier conditions. The historical development of this region also coincided with the westward expansion of the United States, where settlers established farms and ranches.

Other regions mentioned do not fit the geographic description as precisely. The Great American Desert typically refers to arid areas that are less conducive to agriculture. The Farming Frontier generally encompasses agricultural development but is not a specific geographic term like the Great Plains, which denotes a specific location. The Mining Frontier pertains to areas known for mineral extraction, which can be found primarily in mountainous regions, making it unrelated to the flatter land between the Mississippi and the Rocky Mountains.