Berkeley, California's police force gets ahead of the curve by adopting centralized and consistent training, communications, and order throughout its police force.
Pennsylvania becomes the first state to establish a state police force, as recommended by Theodore Roosevelt to help control the numerous labor riots going on in the state's hill country.
Once again, New York led the way with adopting the first detective unit across the pond. More cities followed suit and then followed suit again after New York City disbanded its detective unit due to corruption.
New York City was the first American city to establish a municipal police force. Soon after, Boston, New Orleans, Cincinnati, Philadelphia, Chicago and more followed suit.
