I suspect that the majority of the Haradrim were destroyed because Sauron chose to utilize as many of them as possible in the War of the Ring. After all, he didn't care about protecting the realm of Harad in the aftermath; all he wanted to do was crush Gondor as swiftly as possible.
Middle-earth would have been an empty place in the 4th Age.
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Los Ingobernables de Harlond
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