Bargaining with the State from Afar

In the early 1990s, when organizations representing the 2.6 million U.S. nationals living abroad appealed to Congress for their own non-voting representative, the response of one Senator was to dismiss these "moans of the mink-swathed Americans abroad." However, the image of a life of luxury abroad is usually a harsher reality complicated by income taxes, military duty, and legal jurisdiction. What exactly is the obligation of a state toward citizens who live outside its borders? Bargaining with