https://en.wikipedia.org/wiki/Lead%E2%80%93crime_hypothesis
murder rate in USA dropped in 1990s - was it due to lead free gas or
more cops or more prisons or more abortions etc?
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more info here
https://en.wikipedia.org/wiki/Crime_in_the_United_States#:~:text=In%202018%2C%20the%20US%20murder,a%20total%20of%2015%2C498%20murders.
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murder rate dropped by 50% in USA in 1990s -
https://en.wikipedia.org/wiki/Crime_in_the_United_States#/media/File:Homicide_rates1900-2001.jpg
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