Peter Turchin points to a blip in violence in the 1970's, and the 1920's (think Prohibition), and maybe also the 1870's. These are on top of a long-term downwa

Peter Turchin points to a blip in violence in the 1970's, and the 1920's (think Prohibition), and maybe also the 1870's. These are on top of a long-term downward trend, though.