MO is the postal abbreviation for the state of Missouri. Missouri is a state that is located in the midwestern region of the United States.
French Canadians were the first settlers to inhabit the what is now Missouri. They came from the area of Illinois around 1750. They settled in what is now known as St. Genevieve, which began to thrive agriculturally. St. Louis was founded in 1764, and it grew as a trading post in the fur trade. Missouri's climate fluctuates greatly between the winter and the summer. It is humid and hot during the summer and frigid and cold during the winter.