alternatehistory.com

Context:
I was looking at US crime statistics, and found something interesting -- violent crime did rise in the 60's and 70's, but then took a little dip in the early 80's, before rising again and reaching their real peak in the early 90's.
So the challenge -- with the latest possible PoD, and without preventing the crime wave in the 1960's and 70's, how can said wave peak (longer term) in 1981? What would be the effects?
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