I understand there are many regional accents (both in the UK and US), and I understand Quebec got its accent from rural France and evolved further on its own.
I’m wondering for the US, when did the accents from Britain (since the days of the colonies) start develop on its own and how?
More can always be said, but this answer from the u/lord_mayor_of_reddit is probably the best place to start: https://www.reddit.com/r/AskHistorians/comments/5toz0o/how_and_when_did_the_american_accent_come_to_be/