Animinated Map of the United States Borders, development of regions, states over time
http://www.businessinsider.com/animated-map-of-200-years-us-border-territory-changes-2016-1
Interactive Map with Waste in the US over time (connect to communities developing near water, infrastructure of USA) https://www.saveonenergy.com/land-of-waste/
History of Urbanization in the World including cities in the USA http://metrocosm.com/history-of-cities/
Immigration-http://teacher.scholastic.com/activities/immigration/tour/stop1.htm
Natural Resources-https://www.pebblego.com/modules/2/categories/2949/articles/2193
Smithsonian's History Explorer