With regard to the recruitment of Black players, discochris is correct. Every major southern program was segregated in 1960. Fortunately for Minnesota, its coach, Murray Warmath, was not a racist. He recruited Bobby Bell. Seeing that, other Blacks, such as Sandy Stephens, Bill Munsey, Carl Eller, Aaron Brown, and Judge Dickson, soon followed. I don't know about Wisconsin, but when the Gophers played Iowa in 1960, the Hawkeyes were led by Wilburn Hollis, the first African-American to quarterback a Big Ten No. 1-ranked team. Iowa had 11 Black players on the team at that time. Sandy Stephens, by the way, became the first African-American to start and win a Rose Bowl. Would all of these players come north to MN or Iowa if they would have had the opportunity to play for their home schools? Probably not.
Once the southern schools opened up their programs to Black athletes, Minnesota had to compete with them and, sadly, could not. Over time, for many reasons (lack of facilities, weather, competition from pro sports, mediocre coaches), the Gophers have found it difficult to be much more than average.