This is from the FBI Uniform Crime Statistics. You can see that there is a fairly low rate of violence in the '50s and the '60s, then it soared upward for several decades, and began a precipitous decline, starting in the 1990s, so that it went back to the level that was last enjoyed in 1960.
Informācija no FBI kriminālās statistikas: redzams, ka 50tajos un 60tajos gados vardarbības līmenis visai zems, tad tas vairākas desmitgades pieaug, un līdz ar 90tajiem gadiem iesākas stāvs kritums, kas ved līdz pat līmenim, kāds tika pieredzēts 1960tajos.