Brazil shares a history of Indigenous peoples, European migration and Africans brought through slavery. But the balance looks very different from one region to another.

A 2019 review combines 51 studies covering 81 populations across 19 states. Its sample-weighted averages are 68.1% European, 19.6% African and 11.6% Indigenous American ancestry.

In the South, the European estimate reaches 81.8%. Portuguese colonization and later immigration from Europe helped shape this pattern. The southern sample is overwhelmingly from Rio Grande do Sul, so it cannot represent every southern community equally.

The Northeast has the highest African average: 35.2%. Even within that region, the reported estimates differ sharply: 43.2% in Bahia versus 18.7% in Ceará. Their distinct histories of slavery, settlement and mixing matter; neither figure describes every resident.

Further north, Indigenous ancestry reaches a regional average of 27.7%, the highest in the review. The legacy of Brazil's first peoples remains part of many families beyond Indigenous communities themselves.

Local histories add another layer. Quilombos include communities formed by people escaping slavery. In 15 studies of Afro-descendant communities, analysed separately, African estimates range from 26% to 89%. A shared community label does not imply one genetic profile.

These are estimates from varied samples and genetic reference panels, weighted by study sample size—not a census of Brazil. Methods and recruitment affect the numbers, and DNA percentages do not define ethnic identity.

📚 Source: Souza et al. (2019), Genetics and Molecular Biology
A systematic scoping review of the genetic ancestry of the Brazilian population

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