IT's always been a thing that I ask myself: I see blacks in Corrientes selling jewlry, I learnt they are mostly from Haiti and French speaking Africa. Some very few Cubans.
The thing is that in Montevideo, Uruguay, blacks, though a small percentage, have always lived there, before the white immigration, and are and have been for 200 years a completely accepted group.
Buenos Aires in the 1800s had a large black population, but they seem to have disappeared and is something no Argentine will talk about. I've heard that Uruguay has always been the Free side of the river, so for centuries each time someone would feel threatened in this side (for being Protestant, Politically persecuted, etc) they would just cross to Montevideo.
Also, there are no Indians and South East asians in Argentina, and I think that's a shame. But in the case of Africans I'm positive there were a lot in the 1800s so that's why I'm still rather obsessed about the isssue.
As for the haircut, what's the problem, many Italians have exactly the same curls, so barbers or hairdressers should know how to handle it... !