"The Lord of the Rings" is, of course, a fantasy, so to make demands on the economic and political credibility of this world would be strange. And Tolkien still created a myth and adventure story, not a historical chronicle.
Therefore, at first acquaintance some things may seem too illogical. For example, the issue of supplying many thousands of armies of the Dark Lord. Sauron had tens of thousands of orc soldiers that he was training as an invasion army for Gondor, the Elven lands, Dale and other territories.
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