We may well remember
That there are more Englishes* than just British and American. British English itself quite diverse, and the English of Scotland is as different as American English is from the English of England. That's before we even consider Ireland, Australia, Canada, South Africa, and New Zealand, which have features that distinguish their Englishes from other, closely related varieties.
And to really mix things up, keep in mind regional dialects. In the US, a speaker with a "Louisiana" accent is almost unintelligible at first pass to somebody who speaks an "Upper Midwestern" dialect. Who ever thought a living language would be so complex?
https://www.washingtonpost.com/blogs/govbeat/wp/2013/12/02/what-dialect-to-do-you-speak-a-map-of-american-english/
^^ WaPo article in the above link is an interesting read that is at least tangentially relevant ^^
*is "Englishes" even a word?