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Because they're poor and away from economic powerhouses that exist along the coast.
There are a lot of correlations there. Places that have more trade are typically the "economic powerhouses". Places that have more trade also have more exposure to other cultures and lifestyles tend to be more liberal. Places that are more affluent attract more people including immigrants (goes with trade) and places that are have more immigration tend to be more liberal.
What point are you making? It's not a coincidence most of the economic powerhouses in the united states are around the borders.
places that are have more immigration tend to be more liberal.
yeah sure if you demographically replace non liberals then you will have less non liberals.