Is it bigamy when someone is married in the US and married to someone else in another country?

Me and my ex-husband got divorced in CA in 2010. He has recently remarried someone else in WA, but we are still married in Brazil, where I originally come from (and we are still married in all of the Brazilian consulates in the world). I have been contacting via email and Facebook since 2012 asking him to sign a consent of validation of our divorce so I can fix our situation in Brazil, but he hasn't been cooperating.
So, I would like to know :
1) if he is in bigamy and,
2) if so, who are the authorities that I should report this to?