VERY cool...from Fast Company
"Radical Cartography recently dug up dozens of maps from the 1870 Census Atlas. They're gorgeous--and they reveal much about what set the country on its path to greatness--and what created our modern government.....As you can guess, the country was overwhelmingly young, comprised of children and working adults. This graph shows age distribution by state. Young are at the bottom of each graph; old at the top; left is male, right is female, and the shading tells you which is larger:"
Click through...it really is worth it!