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alternatehistory.com
Crime rates in the US dropped significantly since the 1997 from where they stood through the 1980s and mid 1990s. They've stayed in a lower range throughout the OTs and 2010s.
See line graph for a partial illustration:
Here's the alternate history challenge -
Keep them at least in the range of where they were from 1980 to 1996 through the present-day, never sinking below the floor of where they were in 1996.