I did misspell it, a typo error. The word repercussion though means "an action or effect given or exerted in return : a reciprocal action or effect". So what you were literally asking was whether what the other person did would have any legal effect to you. In other words, would you end up suffering some legal consequence from what he did? If that is truly what you wanted to know, the answer is likely no, but again without details it's hard to say. I was guessing that you were really wanted to know if you had any legal remedy for what the American did, i.e. is there some legal action you could take against the American for what he or she did. But here, too, without details it's impossible to say what recourse you would have for what was done.
Certainly you can report the facts of what was done to the local police in the city/county were the American lives if you know where that is. You might also report it to the Federal Bureau of Investigation (FBI), too, and jk provided a link for that. The federal law on blackmail is very limited and it is unlikely that the American violated that law, though what he did might violate some other federal law perhaps. It is more likely that some state law was violated.
You might want to read an overview on blackmail to see what generally constitutes blackmail in the U.S.

