There is a lot of inaccuracies in your question.

The Spanish, being Roman Catholics, followed a hierarchy established by the Catholic Church.

That being that supposedly soulless savages could be redeemed and saved by baptism and conversion, but could never be as holy as a white man who (in their perspective) resembled a whiter Jesus Christ.

In North America, with Protestant and Anglican colonies, their was no hierarchy of saving souls, just more that people were of Christ or they weren’t.

Spanish missionaries tried to save and convert whereas English missionaries viewed savages as heathens to be exterminated.

Both were founded upon racist views, the Spanish just had a lowly place on the social hierarchy for natives, specifically Indios.

The modern day tanner skinned Mexican is the product of either pure Indio blood line, or a mix of Indio and Spanish, known as mestizo.

White South Americans like Giselle Bundchen are literally the product of direct European ancestry, whereas Eva Longoria (or Danny Trejo or Michelle Rodriguez) is a product of Indio European Ancestry, which is very common amongst modern day Mexican peoples.

When you encounter a dark haired, dark complected South American, you are most likely encountering an heir of the original peoples of Mayan, Aztec or originally Olmec peoples, much like those first encountered by Columbus and the Conquistadors.