I would think for the most part that Wisconsin and Minnesota would produce the same percentage of D1 athletes. If that is the case could the fact the Minnesota produces an extraordinary amount of D1 hockey players have an impact on the number of D1 football players particularly in the skill positions?
Also I really think Minnesota kids simply don't get as good of oppertunity to play D1 football as in states that are considered football hotbeds. I think the top MN schools could play with most anybody in the country if given the chance. A few years ago Rockhurst was scheduling a game every year against a Minnesota school. Rockhurst seemed to always be ranked in the top 25 or so teams in the country and have 3-4 D1 commits on both sides of the ball, and they would come up and play teams that wouldn't even be ranked in MN and the game would be competative. They even scheduled Becker one year when they were still a 3A school and I think the game was 28-14 or something in Rockhurst's favor. A nice win sure but it wasn't a dominating win, I think they also had a close game with Edina.
I'm not saying that Minnesota is a hotbed for football and loaded with D1 talent or even has more than any other state but there is a lot more talent hear than given credit for. Just look at the success of UMD, the Dakota schools, and the D3 teams. Those teams are filled with Minnesota kids and have great success at the lower levels, there has to be kids on those teams that could have been solid starters at a Big Ten school if given the chance and with good coaching. I'm not even saying Minnesota is a hidden gem with talent, I just believe there is a certain percentage of players that can play D1 ball no matter where they are from.
In addition to Minnesota kids I think ther are probably more kids with raw talent in North and South Dakota, and even North of the border that could be coached up. Football isn't a sport that takes years and years of practice to develop like some other sports. It is a sport based on speed, size, and strength with the exception of a few positions. Those are traits you are born with for the most part, and I would guess the percentage of kids born with those traits are similar all around the country.
It would be interesting to see statistics on the percentage of kids that receive D1 scholarships that make it to the NFL from each state.