@orekix @matrix I wrote a lenghty post and Firefox mobile killed it :^)
Paraguay: the indigenous culture is very alive. I admire their use of Guaraní along with Spanish. I find it preferable to our (argentina) snob use of English words.
Argentina: North: Qoms (or as their cross-river neighbours derisively called them, Tobas) couldn't integrate for the most part. They have many problems and stigma associated nowadays. I was surprised when a girl I knew from university told me her grandmother was Qom.
Collas (traditional zone, close to the Chile-Arg-Bolivia corner) have one of the best situations I can think of. They take part of huge televised recitals around February. They might have took part of the first colonization trend that you were discussing unlike the Qom, who repelled settlers well into the XX century.
Being of mixed ancestry is normal from north-center to north-west, and aboriginal roots are not strange. Maybe the scorching sun and torrid northern wind makes us brothers in suffering. We are far from perfect but it's something.
What is strange is African people to be honest. Most seemed to have ended at Brazil and Uruguay when freed from slavery here, or something else that I'm not aware of happened.
Mid country (XIX century?) we had "The desert campaign", late colonialism which expanded the border towards the south. It was bloody.
And I'd like to honorifically mention the Ona people (Selknam), all the way to the southern end of the continent. They were hunted and exterminated like animals by British sheep farmers.