When looking at the dominance of those states I think the first thing you do is look at proximity to wrestling colleges.
Pennsylvania has a combined 40 NCAA wrestling schools with 7 of those being D1
New York has 24 and 6
Ohio has 22 and 4
New Jersey has 8 and 3
Oklahoma has 3 and 2
I think North is having success because they are perfectly located 45 minutes from both D1 universities and in the backyard of the D2 National Champs
Pennsylvania has a combined 40 NCAA wrestling schools with 7 of those being D1
New York has 24 and 6
Ohio has 22 and 4
New Jersey has 8 and 3
Oklahoma has 3 and 2
I think North is having success because they are perfectly located 45 minutes from both D1 universities and in the backyard of the D2 National Champs