You have to remember the dynamics of the current day American economy. The northern states have higher taxes than us. They have higher unemployment and fewer companies that are locating there.
families are gravitating to where the jobs are, which at this time, is the south. Middle Tennessee is becoming very attractive to companies that are re locating.
There are 3 major interstates that intersect in Nashville. There is a good work force. It is a Right to Work state. The Governor will sell his own sister to convince companies to move here.
ONce families from Ohio, MIchigan, New York & Illinois, notice those are Democratic controlled states with high taxes, high crime, less freedoms & high un employment, move here their athletic kids will not return to the cold northern weather to attend college. They will remain the in the south.
So, T.O.S.U., Michigan, Penn State, etc will see their recruiting pool suffer.
Many won't like the political/socioeconomic facts you've listed above, but there's plenty of merit to it.
Another key component, and I'm fearful of the 'That's Racist' Meme/GIF backlash I'm about to be hit with, is the distribution of African Americans as a % of each states' population. Look at 2010 census data, you'll find the majority of Blacks live...you guessed it, in the South. With such a huge pool of incredibly gifted athletes, its no wonder BIG has to recruit down South to survive.
According to 2010 census data, Tennessee's black population ranks 10th in the nation. Growing up in East Tennessee, I'll admit, I was a bit shocked by that fact.
By State Black % of Population (2010 Census data):
1 Mississippi 1,074,200 37.30%
2 Louisiana 1,452,396 31.98%
3 Georgia 2,950,435 30.02%
4 Maryland 1,700,298 29.44%
5 SC 1,290,684 28.48%
6 Alabama 1,251,311 26.38%
7 NC 2,048,628 21.60%
8 Delaware 191,814 20.95%
9 Virginia 1,551,399 19.91%
10 Tennessee 1,055,689 16.78%
11 Florida 2,999,862 15.91%
12 Arkansas 449,895 15.76%
13 New York 3,073,800 15.18%
14 Illinois 1,866,414 14.88%
15 NJ 1,204,826 14.46%
16 Michigan 1,400,362 14.24%
17 Ohio 1,407,681 12.04%
18 Texas 2,979,598 11.91%
19 Missouri 704,043 11.49%
20 PA 1,377,689 10.79%
21 CT 362,296 10.34%
22 Indiana 591,397 9.07%
23 Nevada 218,626 8.10%
24 Oklahoma 277,644 7.96%
25 Kentucky 337,520 7.71%
This fact adds to the importance of effectively recruiting the South. tOSU, Michigan, and all other teams from the North have little to no choice but to come South to recruit.