Graphic novel series about a Civil War in America between, from what is written, a faction from conservative America and the U.S. government. The main setting is NYC which is under seige by the two side and is a "DMZ" of sorts. A whole nation onto itself develops there as people in Manhattan are trapped on the island. It is really entertaining if just from the POV of what could happen in a scenario like that
http://en.wikipedia.org/wiki/DMZ_(comics)
