for modern day boundaries, there has been a feature request for that: https://forum.inaturalist.org/t/include-indian-reservations-communities-rancherias-pueblos-as-places/10354, and think that these boundaries would need to be established with extra care and consultation.
if there’s serious consideration of trying to systematically establish historical boundaries, i would just suggest that the same kind of care be taken by whoever takes on this task, along with some thought in advance on how to handle slippery slope possibilities, like establishing pre-colonial land boundaries in Africa, etc. there may also need to be some extra place types established to classify these kinds of places appropriately (https://forum.inaturalist.org/t/cultural-specific-place-types/10441).
for either of these kinds of places, if being created in the system, if the goal is to bridge audiences, it may also help to allow a place to have multiple names associated with it (https://forum.inaturalist.org/t/add-additional-names-to-the-same-place/5480/), similar to the way taxon names work.