Hot, crispy nice hobbit is right; the Haradrim and the Easterlings would have taken any opportunity to fight against Gondor and Rohan, even if it meant siding with Sauron. I suppose they figured Sauron, considering how powerful he supposedly was, would in no way lose the war, so they were in on a pretty good deal. ^_^
Of course, we all know what happened there....
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