Blazing Saddles

In order to ruin a western town and steal their land, a corrupt politician appoints a black sheriff, who promptly becomes his most formidable adversary.

A town where everyone seems to be named Johnson is in the way of the railroad. 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. Hedley convinces him to send the town its first sheriff.