| It's a cultural thing.
NE and the Midwest have been homes to industry much longer than the Souht and Southwestern US. They've also been home to unions much longer. As a result, states have differing laws on unions. In the NE and Midwest, one can be made to join a union as a condition of employment. Here in the South, that's not possible ("right to work" states).
As a result, unions are weaker here in the southern US. | 
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