It's pretty much impossible to say what peoples and nations inhabited what parts of Middle-Earth some 4500 years before the War of the Ring, except for Lindon, Eregion, Moria and what very little Tolkien tells us of the Numenorean holdings.
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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