The militarization of law enforcement and its consequences have been a disaster for the human race.
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This is not accurate.
The timeframe is not wrong; it is true that the concept of the modern police, at least in the US, was largely based on the Peelian model created in London in the 1820s. But saying it evolved from "warehouse guards and slave patrols" is ahistorical. Most modern police forces modeled after London's Metropolitan Police replaced night watch systems that have been around for literally all of recorded history.