Here is one of those eureka google stumblings I have on the vary rare occasion, and in this case I'm showing off an atlas of America from 1492 to now. While this may not initially seem thrilling, I was able to see the shape-change of politics, industry, wealth, and population over the span of American development. It was particularly interesting to see an animated display of topography change and to zoom in to a location in which one of my fiction or non-fiction pieces is set and see the way the land was actually for the period in which I'm writing.
A big thank you goes out to the University of Richmond. This is nothing short of amazing and proof that the internet sometimes makes more room for living when the research can be this easy.
Tour the Atlas and its tidy Table of Contents here.