How did the institution of policing in the US being?

Anwser: The modern police force started in the early 1900s, but its origins date back to the American colonies. In the South in the 1700s, patrol groups were created to stop runaway slaves. In the north, a formal police force was created to control immigrants who were moving into cities in the 1800s.

Explanation:

the words “strangest” and “unusual” suggest that the narrator is about to tell the story of an odd or puzzling group of people.