OMG, guys, this is FASCINATING. It’s not just that the separation of the colonies and Britain happened, it’s that the British were also changing THEIR accent simultaneously, as were certain ports of call in the Americas, AND it explains why the Irish and the Scottish sound different from the British, and why some East Coast cities sound more British than anything else. I’ve been wondering about this stuff for years! Rhotacism, where have you been all my life!