Just a guess, but UK's accents have been developing for a 1000 years while the US has only had a few hundred at the most. Probably just less sticky. That said, bums me out because I love my region's dialect. I grew up in N. Georgia in the boonies and I love coming home to hear the accents.
Love that kid! I live just south of Nashville, but I'm originally from rural Northern California. When we moved here about 10 years ago Southern folks were far more comfortable speaking with their local accents around us transplants. But there have been tons of people moving in from all over our country. Now a lot of folks "cover up" their accents. It's a super bummer. I also realized it's the same thing I do. I sound different when I go back home to rural farm country in California.
Yeah, there's a mass of outsiders moving into my hometown and while it has been good for the local economy, it has really eroded the culture in a big way. It's gentrification, but on poor whites. It was gonna happen eventually, but I do hate watching it happen for selfish reasons.
I used to cover up my accent but I let her rip now. lol. Last of the Mohicans.
https://www.youtube.com/shorts/YYx51ZrSn3g