That’s a false fact.
And it’s apparent, since there are dozens of accents in the US as well as umin the UK and there were dozens in the UK 200 years ago. They all developed in their own direction, being sometimes isolated sometimes cross-pollinating with other accents, but none staid the same.
I’ve heard Canadian French is closer to the French France Frenched a few hundred years ago.
IIRC that’s correct.
Kinda like how the American accent is closer to OG British English than the current British English pronunciation.
That’s a false fact. And it’s apparent, since there are dozens of accents in the US as well as umin the UK and there were dozens in the UK 200 years ago. They all developed in their own direction, being sometimes isolated sometimes cross-pollinating with other accents, but none staid the same.