Short answers, pulled from the story.
The word police first appeared in English during the early 15th century with meanings that ranged from public policy to state administration. This term traveled through Middle French as police, which itself derived from the Latin politia.
Patrick Colquhoun founded the Thames River Police in 1797 based on utilitarian views creating a deterrent through continual presence rather than reactive punishment. This organization was created to address crime along the river using preventive principles promoted by Jeremy Bentham.
Austria, Chile, Israel, New Zealand, the Philippines, South Africa, and Sweden maintain single national police forces rather than fragmented systems. France operates both civilian Police Nationale and paramilitary National Gendarmerie where urban areas receive civilian policing and rural zones get military-style protection.
Global movements gained popularity starting May 2020 in Minneapolis Minnesota after George Floyd murder sparking calls for defunding or full abolition of police forces. These protests coincided with intensified racial profiling accusations since the 1960s following incidents like the 1965 Watts riots and videotaped Rodney King beating by LAPD officers.
American law enforcement represents a highly decentralized system containing over 17,000 separate state and local agencies including sheriff offices, county police, and federal bodies like the FBI. Federal agencies such as the Federal Protective Service patrol government buildings while Park Police protect national parks and Amtrak Police secure stations and trains.