Europeans have been settling in North America for 500 years. The United States being a young country has nothing to do with the evolution of accents and dialects. When the US was formed the Spanish had been in the Americas for 200 years, the French and English not much less, in addition to enslaved Africans who brought their own native languages to the continent and then were forced to learn English, Spanish, French, or Portuguese. That alone is more than enough time and groups of people for dialects and accents to develop.
I honestly have no idea how much cable costs where I live and it’s not for a lack of trying. I’ve tried to look but it’s literally not possible to look on mediacom’s website to get cable prices unless I add a cable package to my internet plan. My only other option is to call them, and their entire support is outsourced and it’s a toss up on whether I get someone who speaks English or not. One time the call center person spoke so little English that they had to transfer me to someone else.