Which landform dominates the United States?

The landform that dominated the United States is mostly taken by plains in which is a landmass or broad area that doesn’t contain much elevation and is usually flat. This is the landform that takes place in most parts of the United States.

I believe the answer is: mostly taken by plains in which is a landmass or broad area that doesn’t contain much elevation and is usually flat.

These plains is often very ideal for people to live since it tend to provide good soil composition for various plants to grow, enough water sources, and provide good ecosystem for various organisms to live. It also provide a level of weather that is not too extreme.