From the National Atlas web site:
Maps of America are what you'll find and make on nationalatlas.gov™. Maps of innovation and vision that illustrate our changing Nation. Maps that capture and depict the patterns, conditions, and trends of American life. Maps that supplement interesting articles. Maps that tell their own stories. Maps that cover all of the United States or just your area of interest. Maps that are accurate and reliable from more than 20 Federal organizations. Maps about America's people, heritage, and resources. Maps that will help you, your children, your colleagues, and your friends understand the United States and its place in the world.
This is nationalatlas.gov™, and it shows us where we are. It allows you to use your imagination and, by probing and questioning, to choose the facts that fit your needs as you explore the American story.