What are the natural features of the American frontiers?

The American frontiers are characterized by diverse natural features, including vast plains, rugged mountains, dense forests, and expansive deserts. The Rocky Mountains run through the western part of the continent, while the Great Plains offer sweeping grasslands ideal for agriculture. Rivers like the Mississippi and Missouri provide vital waterways for transportation and commerce. Additionally, the varied climate across regions supports rich ecosystems, from arid deserts to lush wetlands.