http://www.tufts.edu/alumni/magazine/fa ... -arms.html
The US can be divided into 11 separate "nations", all of which have different attitudes towards violence. The most violent are those whose economy is based on herding animals. (Somalis take note.)
"Continuing to treat the South as a single entity, Nisbett argued that the violent streak in the culture the Cavaliers established was intensified by the “major subsequent wave of immigration . . . from the borderlands of Scotland and Ireland.” These immigrants, who populated what I call Greater Appalachia, came from “an economy based on herding,” which, as anthropologists have shown, predisposes people to belligerent stances because the animals on which their wealth depends are so vulnerable to theft. Drawing on the work of the historian David Hackett Fisher, Nisbett maintained that “southern” violence stems partly from a “culture-of-honor tradition,” in which males are raised to create reputations for ferocity—as a deterrent to rustling—rather than relying on official legal intervention.
More recently, researchers have begun to probe beyond state boundaries to distinguish among different cultural streams. Robert Baller of the University of Iowa and two colleagues looked at late-twentieth-century white male “argument-related” homicide rates, comparing those in counties that, in 1850, were dominated by Scots-Irish settlers with those in other parts of the “Old South.” In other words, they teased out the rates at which white men killed each other in feuds and compared those for Greater Appalachia with those for Deep South and Tidewater. The result: Appalachian areas had significantly higher homicide rates than their lowland neighbors—“findings [that] are supportive of theoretical claims about the role of herding as the ecological underpinning of a code of honor.”"
Huh? 
You didn't read the article.
