Explain how cars affected the u. s. landscape

Landscape and cars. Lets consider. Cars commute pollution, and with this, this would affect the landscape, and not only this, but also the enviorment. And because of this, the crops and the landscape is not always the same. They have been polluted. This would be the great affect (in a bad way) of the affection of the cars that they had on the landscape of the (U.S).

The answer would be west.