A lot of it has to do with the immigrants that lived and settled in the areas decades/centuries ago. Then over time the foreign accents blend with the local accents creating a hybrid of the accents in the area.
For example, the New York/New Jersey and Chicago accents are heavily influenced by the Italian immigrants.
The Boston accent is influenced by Irish immigrants.
Minnesota/North Dakota is influence by Scandinavian settlers.
New Orleans/Louisiana is influenced by French/Acadian immigrants mixing with the southern twang.
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