An area, called the Corn Belt, is used for growing of corn, and cereals. Other important plants are cotton, tobbaco, soya and fruit, usually in Florida.

Traffic is very important, too. People usually use highways, trains, planes (the biggest airports are in Chicago, New York and Dallas), boats and ships (the biggest harbors are New Orleans, New York and Houston, inland harbors are Duluth, Pittsburgh and St. Louis).