Except for defensive palisades, Powhatan farmers had no fences around their fields. Why screen off land if no cattle or sheep had to be kept inside? The English, by contrast, regarded well-tended fences as hallmarks of civilization, according to Virginia D. Anderson, a historian at the University of Colorado at Boulder. Fenced fields kept animals in; fenced woodlots kept poachers out. The lack of physical property demarcation signified to the English that Indians didn’t truly occupy the land—it was, so to speak, unimproved.