I thought that Middle Earth was more or less meant to be an ancient, mythical precursor of our own recorded history (with the West as Europe, Harad ('South') as Africa and Rhun ('East') as Asia), so I would imagine Middle Earth would be more and more about conflicts between men, as there are hardly any other races about: no more Elves, less and less Orcs, Ents dying out and Hobbits and Dwarves not showing themselves very much (and probably dying off as well). The Lord of the Rings already mentions Elessar and Eomer campaining in Rhun against the Easterlings, I suppose this would have continued under Eldarion and beyond?
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