"Borders are all-important imaginary lines that affect our lives in myriad ways. They define in a very literal sense where we live, who we call neighbors, and how we are governed. But in a world defined by instantaneous communications and commutes that can just as easily involve airports as train stations, many borders are relics of a bygone era."
Most semesters I have students redraw the United States map into regions and it is a productive session to understand the concepts of region, place and culture. This article echoes the proposal of geographer Etzel Pearcy to divide the country into 38 states. This comes from an excellent blog about density: http://persquaremile.com/
Via Seth Dixon