Yes, your driving licence helped you in an unexpected way.
(US English = driver's license. You are definitely American!)
Yes. If by "Americans" you mean U.S. citizens, I do have a U.S."driver's license" and speak English with a U.S. vocabulary.
Your incisive observation skills suggest that you are English or the distant progeny of one of their Empire acquisitions.

He does dance English skillfully.(to steal your word- quite like it) He has to be British at least.

I had a Miami Florida driving licence. My wife has a British licence, unfortunately.