Red/blue divides exist within states, but there's a lot more common ground. For example, half of Black people in Georgia oppose abortion. Folks in Atlanta might vote Democrat, but they don't see deeply religious people as aliens the way folks in San Francisco do. In another example, folks in San Francisco would have called Larry Hogan a fascist for sending in the Maryland national guard in response to the Freddie Gray riots. But his approval rating in majority Democrat Baltimore shot up to 70%. The bigger problem is having New York City/San Francisco in the same union with rural Georgia and Alabama. It's not workable.