Is it possible to learn this power?

Anybody whose able to speak another language than english can do it.

But that does exclude a lot of americans.

You only need a couple of phrases (and a practiced accent/pronunciation) to seem believable enough for them to give up
This. The sayings we all know can easily be repurposed. I am sorry I don’t speak [language]. I do not understand you. Please. Thank you. Where is the restroom.