Contents:
1. Introduction
2. Summary
3. Figures/Images
4. Sources


1. Introduction

Unlike my previous articles on racial/ethnic genetics, this article will not contain a detailed breakdown or history for each region. It contains a few figures/images lifted from studies that summarize the genetics of each country in Latin America. Some countries are missing because it was impossible to find data on those regions.

Unfortunately, self-reported “race” in Latin America often does not align with the genetic data, so I couldn’t use that as a stand-in. I’ve seen a lot of cases where people who are 20% Black claim to be “White,” and where people who are 80% White claim to be “Amerindian,” and so on.

I will update this article in the future when I find more data.

2. Summary

Latin America is genetic chaos, to put it bluntly. Unlike North America, where miscegenation was banned and discouraged, centuries of racial intermixing means that >99% of Latin Americans (discounting recent immigrants) descend from at least two major races, Europeans and Amerindians.

In addition to this ubiquitous “Mestizo” admixture, most Latin Americans also harbor Sub-Saharan African ancestry due to the slave trade, making them triracial. Some even descend from four or more major races, with additional ancestry from e.g. East Asians or South Asians on top of the aforementioned racial groups.

The image below shows a basic three-way admixture analysis for the averaged populations of Cuba, Puerto Rico, Mexico, Guatemala, Costa Rica, Colombia, Ecuador, Peru, Bolivia, Brazil, Chile, and Argentina. As you can see, African ancestry is most prevalent in Brazil and the Caribbean, Amerindian ancestry is extremely high in Peru and Bolivia, and European ancestry is highest in Argentina and Cuba. Judging by other studies, this admixture analysis is a little off in places, e.g. Brazil, but it’s still a good summary.

3. Figures/Images

3.1. Summaries

Continent-wide:

Major South American countries:

South American west coast + Argentina:

3.2. Cuba

3.3. Mexico

3.4. Brazil

3.5. Bolivia

3.6. Argentina

4. Sources

I read a ton of studies but these are the only ones I remembered to save:

Summaries:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4177621
– Genetic History of Latin America: Fine-scale population structure, sub-continental ancestry and phenotypic diversity

Mexico:
https://bmcgenomdata.biomedcentral.com/articles/10.1186/s12863-018-0707-7

Cuba:
https://www.nature.com/articles/s41598-018-29851-3

Brazil:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6905439
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3779230/
https://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1004572

Bolivia:
https://www.fsigenetics.com/article/S1872-4973(14)00239-7/fulltext

West Coast:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4670080