Good Morning ! I am an American citizen and I travel to Argentina and I got married in Mendoza. We got divorced in Florida but they tell me I'm still married in Argentina. That the divorce here is not valid there. What do I have to do to get totally done

You would have to find out if the divorce of Florida translated and aposgillated by the beech serves to homologate it in Argentina so figures there also as divorced. If you do not have to do the divorce process there cpn a lawyer that costs about 300 dollars or more according to who does it.

I want to know if it's true that I have to divorce there too?

Divorce in Argentina.