When people were escaping England to come to America...? Listen to the recent Bitcoin Standard podcast on Conceived in Liberty. That is now high on my reading list.
Discussion
I think the peak of English idyll is after the peak of US-bound migration
Another historical episode I think was relatively peaceful was the Wild West / Old West period. I think the "outlaw" system did a better job retarding crime than modern mass policing.
This purports to show US homicide rates marginally lower in the 50s & 60s
https://www.statista.com/statistics/187592/death-rate-from-homicide-in-the-us-since-1950/