Most states have two large universities: "Whatever State" and "The University of Whatever." Is there a semantic reason for this? [duplicate]

I live in South Dakota. We have both The University of South Dakota, and South Dakota State University. They are both large public institutions. Each is known for a specialty (USD is business, law, and medicine; SDSU is agriculture, science, and engineering), and one (SDSU) is a fair bit larger than the other. However, they're more or less the same.

Why the different naming, and does the name format carry any meaning?

My immediate impression is that we had two different institutions, and they simply needed different names. But is there some larger, systemic reason for the different in naming? Does the format of the name imply anything, in general?

(Note: I'm using South Dakota as an example here. The same naming convention is true of most every state in the US.)

State Universities are land grant schools, and generally they're ag schools as a result. https://en.wikipedia.org/wiki/Land-grant_university