FWIW The evidence we have (not much I can find) seems to suggest that Native Americans today may not have very different biota. Maybe not surprising since their

FWIW The evidence we have (not much I can find) seems to suggest that Native Americans today may not have very different biota. Maybe not surprising since their diets are more Western than not, now. Biol Lett. 2014 Feb 12;10(2):20131037. doi: 10.1098/rsbl.2013.1037. Print 2014 Feb. Geographical variation of human gut microbial composition Taichi A Suzuki 1 , Michael Worobey PMID: 24522631 PMCID: PMC3949373 DOI: 10.1098/rsbl.2013.1037 We found a positive correlation between Firmicutes and latitude and a negative correlation between Bacteroidetes and latitude. The overall pattern appears robust to sex, age and bacterial detection methods. Comparisons between African Americans and native Africans and between European Americans and native Europeans suggest no evidence of host genotype explaining the observed patterns. https://pubmed.ncbi.nlm.nih.gov/24522631/ https://pubmed.ncbi.nlm.nih.gov/24522631/ Gut Microbes. 2020;11(2):191-204. doi: 10.1080/19490976.2019.1634416. Epub 2019 Jul 16. Gut microbiota composition explains more variance in the host cardiometabolic risk than genetic ancestry Sandra J Guzmán-Castañeda et al https://pubmed.ncbi.nlm.nih.gov/31311405/ https://pubmed.ncbi.nlm.nih.gov/31311405/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7053924/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7053924/