I know both Missouri State and the Minnesota State system are relatively new. Missouri State grew out of Southwest Missouri State University (SMSU), and Minnesota State's two campus that I know of, Mankato and Moorhead, used to be Mankato State and Moorhead State. I think Nebraska grew out of a desire to have it under one system for the University of Nebraska, but I'm not sure. I'm sure the state colleges could transform into a Nebraska State system if they wanted, but all three schools seem happy with their identity. I know Peru State, where I got my bachelor's, always seemed comfortable with it's role/identity just as it is.