What do you mean? Almost every single country in the Americas is a settler-colonial society or is descended from one. They've obviously ended up with very different cultures for the most part but many of them have a similar background. White Europeans turn up, exterminate the local population through a mixture of war and disease and import large number of black people from Africa to 'work' as slaves. Meanwhile white Europeans, whether from North, East, Central, South or West, continue to turn up.
So yeah, South Americans also treated black people as shit, in exactly the same way. Slavery was only abolished in Argentina in the mid 1800s. Also Argentina is a stunning country with great people but I was pretty struck by the almost total absence of black people in that country compared to, for instance, Brazil or Colombia, god knows what happened to them.
Very strange approach to pretend the South Americans and what they do are somehow divorced from European history and culture or that racism isn't widespread and prevalent across South American countries.