Which national event precipitated the rapid expansion of police departments across the United States?

Question

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The Civil War led to the creation of the first national police force, the United States Marshals Service, which was tasked with enforcing federal laws and protecting federal property. This event precipitated the rapid expansion of police departments across the United States as cities and towns sought to establish their own police forces to maintain order and enforce local laws.

Which National Event Precipitated the Rapid Expansion of Police Departments