@@sonofjay817 a multitude of reasons. The kingdom’s of men at this point were weakened and broken, especially Gondor. The elves were leaving middle earth, so no help could be expected from them there. Plus experience, not letting anyone get close enough to cut him. With no alliances, there wouldn’t even need to be a reason for Sauron to enter the battlefield. His amassed forces of haradrim, easterlings, orcs, and Nazgûl would be unstoppable against a middle earth with no alliances.
@@RandomLore5 Makes perfect sense. I actually had this very reason pop in my head as a possible answer as I was typing my question but I figured I'd go ahead and post it to see what someone else's answer(s) might be. Thanks for your reply!