i personally think it would be inappropriate to have that kind of map built into iNaturalist, but if you want to make such a map, there’s nothing that prevents you from building one via the iNat API. i can tell you exactly how to build one (https://forum.inaturalist.org/t/looking-for-inaturalist-observation-map-visualisation-suggestions/7322/10), but you will need to find or create the maps that show who “the original owners” were. (i use quotes because consider all the folks who have lived in, say, the area of modern day Mexico City over time, even prior to the arrival of Europeans.)
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