Need quick visual shorthand for an aggressively encroaching political entity? You want an Cartographic Land Octopus! It's a subcategory of satirical maps. More octopus maps here, here, here.
Springsteen in the USA: 40 years of Touring as a Study in Spatial Diffusion "As a geographer, 1500+ shows over 40 years is an opportunity to map...how phenomenons such as innovation, fashion, or disease spread geographically. Except in this case the contagion is rock ‘n roll."
"The U.S. Geological Survey has just released more than 161,000 digitally scanned historical maps spanning in excess of 130 years and covering the lower 48 states. This Historical Topographic Map Collection provides a comprehensive repository of the landscape of our Nation..."