What is "yessiree"

Usage examples of "yessiree".

Blue Valley became a ghost town, one of the ugliest on earth, with not a single feature to redeem it, and Spade Larkin was forced to turn his back on the grandeur he had uncovered and drift along the streets of Denver, telling newcomers that he was the man, yessiree, he was the man that found Blue Valley, and for a beer he would explain how a newspaper clipping, a little clipping from a St.