There is no in group, out group, or whatever else. Go to Mexico or Canada illegally, as an American, and you're getting deported, same as everybody and everywhere else. Vice versa if a Canadian, Brit, or whoever else comes into the US illegally, they're also getting deported.
If you are illegal, you can literally show up fresh off of jet and on day one in .ar, file a court case for citizenship, have a lawyer run down the clock for a few years (by constitution in argentina illegal residence and subsistence for a few years = citizenship), and all the meanwhile they are legally barred from deporting you.