I can’t answer your question exactly, but within the UK which is approximately 580 miles ‘tall’ end to to end, there are tens of regional accents that develop from the communities that enunciate words differently over centuries and also the cultures and languages that are used that live in thst place. America is a sped up melting pot of culture, think of all the native communities, the massive mix of European, African and Asian communities that have settled and now call the United States home. That has influenced accents and enunciation over the past 4 centuries in particular.
[This video gets into it a bit.](https://youtu.be/H1KP4ztKK0A)
Basically, it comes down to settlement patterns. You have to realize as well that in the time before mass media the only people you would hear speak were from your local geographic region. Therefore what you had was a big echo chamber where differences in pronunciation got magnified.
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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