Blazing Saddles (1974)

A town – where everyone seems to be named Johnson – is in the way of the railroad and, in order to grab their land, Hedley Lemar, a politically connected nasty person, sends in his henchmen to make the town unlivable. After the sheriff is killed, the town demands a new sheriff from the Governor, so Hedley convinces him to send the town the first black sheriff in the west.