More white solidarity = fewer murders?

“The decline of the homicide rate came later in North Carolina than in New England or the Chesapeake, but by the mid-18th century it… also had a low rate ….

“Indian warfare and political strife (including three rebellions against the colonial government) had periodically reduced the colony to lawlessness. But as racial slavery took hold in North Carolina in the 1720s and 1730s, white solidarity increased, and as the colony’s government became more effective, the homicide rate declined….”

— From “American Homicide” (2009) by Randolph Roth