Fun with maps

  http://nationalatlas.gov/natlas/Natlasstart.asp
 
Tons of ways to customize differnet ways to view the USA.

You can display a map of the USA based on Agriculture, Climate, Geology, People, Politics, Transportation, Water, etc.
 
Each of the above categories are broken into smaller groups.
For example, "People" is subdivided into Crime, Economy, Energy Consumption, Health and Population.

 And those categories have further breakouts.
"Economy" contains Average Wage per Job, Food Stamp Recipients, Median Household Income and more.  
 
and those can be displayed via year  
 
... and it's zoomable, too.