AHC: Cultural differences between U.S. states similar to that between Arab countries

With a POD no earlier than 1776, and the U.S. having the same borders as OTL, how could the cultural differences between the states in the United States be about as wide as the cultural differences between Arab countries? Some states for example would have dialects largely unintelligible to other states, like Moroccan Arabic compared to Egyptian Arabic compared to Gulf Arabic.
 
The divergence of various Arabic dialects has been contributed to by Arabic starting as a collection of diverse dialects to begin with, mixing with different substrate languages (Berber, Syriac, Greek, etc.) in the places to which it eventually spread, and then getting "partitioned" due to different regions innovating on the language in different ways. Similar factors led to the divergence of the Chinese dialects from each other To create these same conditions in a post-1776 US, you may need some/all of:
  • More admixture between Europeans and natives, and on a relatively "equal" basis. The kids grow up and absorb European culture and as well as native culture, leading to widespread use of mixed languages like Michif. However, since different regions of the US have different families of native languages, you end up with a large variety of regionally-based English-derived creoles that share a common vocabulary and literary register but vary widely in important aspects.
  • Less acculturation of Europeans with each other. Different European groups pick different regions to settle, and remain regionally dominant despite the possible presence of other ethnicities in the region. The Dutch have already been pretty influential in New York since the days of New Amsterdam, so a greater population of Dutch could retain their economic and political clout while also maintaining cultural similarity in the mold of the Afrikaners. This could also be accomplished by having more Swedes in Minnesota or something. A still-British America might accomplish this, but the relative cultural uniformity of Canada makes me think otherwise. The key to achieving this might be to restrict movement between different regions, which is actually rather hard to do in the US
To accomplish the former: Kind of hard, with a post-1776 POD. Maybe the US never gets New Orleans, leading to the West being a less appealing place for settlement. With less whites in the area, you could allow the natives to have a greater impact on post-contact demographics

To accomplish the latter: A post-1776 US government enacts apartheid-style segregation on the nation, separating not just blacks/natives from whites but also whites from each other. Instead of an Afrikaner/English divide you could have the "white" segment of the population be legally divided into English, Scottish, Irish, Italian, and the like. Different rights may be given to each segment, miscegenation may be generally frowned upon. Each group congregates with other members of its groups, seeking a level of strength in numbers under the protection of local (state, county, whatever) governments that are friendly to that ethnicity's interests. Political separation slowly becomes a cultural gulf, in which most of the population likely has some grasp of "The President's English" but views it mainly as a language to get ahead in life rather than a language to communicate with family, friends, or the local mobsters.
 
During WWI, part of the impetus to segregate draftees by region was language barriers. When the 82nd Division was formed with a mix of draftees from TN, NC, and GA, and then received a large group from NY, the language variation was enough to be an operational problem. Since then, increased travel and communications have actually leveled many differences.

Arabic, to use the initial example, has been spread for 1200+ years, mostly during a time of comparatively difficult travel and communication. American English, on the other hand, has been spread out for <400 years, much of that time over a much smaller area than Arabic, with much easier and frequent travel and communications. Getting to Arabic levels of divergence in American English is really, really difficult.
 
The closest one could imagine is a sort of less centralized US without public schooling that leads to English diverging more greatly. Further then, areas like Louisiana remain firmly trilingual, migrants keep their traditional tongues more strongly due to lack of public education and firm country unity.
 
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