It has been painfully difficult to watch. But the rural areas have always been red.
the main factors, I think and not necessarily in this order.
Redistricting and gerrymandering of legislative districts
The Koch brothers
Americans for prosperity, etc, etc , etc......
Mostly what is going on nationally but with an intense focus.
Their theory is/was as Wisconsin goes, so goes the world.
We were a test case. More states to follow..........