I don’t agree that an implication of the question is that there is only one way “born and bred” Americans sound.

It’s fully possible to ask if an accent sounds like it plausibly belongs to someone born and raised in the US while acknowledging that there are many different ways people who fit that description can sound .

Far from the first

https://en.wikipedia.org/wiki/Flying_car

https://codeberg.org/thethunderwolf/tesseract-blocklist-archive/src/branch/main/tesseract-shadow-policy-2026-07-24-19:50:UTC.json