What is the broad expanse of flatland in the middle of the United States called?

• A. Great Lakes
• B. Central Plateau
• C. Great Plains
• D. Piedmont

Answer: (C)

The broad expanse of flatland in the middle of the United States is the Great Plains. This region sits between the Rocky Mountains to the west and the Mississippi River to the east, spanning a wide swath of central states. The landscape is dominated by prairie and flat or gently rolling terrain, rather than mountains or hills, which is why it’s described as flatland.

That makes it the best answer because it specifically names the vast prairie and grassland area that characterizes inland North America. The other options don’t fit: the Great Lakes are a group of large inland freshwater lakes, not a land region; the Piedmont is the eastern foothill region near the Appalachian Mountains; and a Central Plateau is not the commonly used term for this central U.S. landscape.