With a united, peaceful kingdom being Aragorn's goal, and with no evil being to rally under, it is likely that the orcs all died. As for crossed myths and such, beings such as Grendel could just be like the Watcher in the Water.
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"And forth went Morgoth, and he was halted by the elves. Then went Sauron, who was stopped by a dog and then aged men. Finally, there came the Witch-King, who destroyed Arnor, but nobody seems to remember that."
-A History of Villains
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