It happened right after world war one when Germany was left in ruins due to the war and Hitler proposed a new ideology of Naziism which everyone started to like due to the situation Germany was in at the time.
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Ever since the first pioneers settled in the United States at the East , the country has been expanding westward. When President Thomas Jefferson bought the Louisiana territory from the French government in 1803, it doubled the size of the existing United States.
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For the answer to the question above,
Decrease in unionization. The Sunbelt was and is an area where unions are much weaker than in the old industrial areas. As people and jobs moved to the Sunbelt, unions grew weaker. I hope this helps