TM,
As for Tolkien's depiction of the alliance between Rohan and Gondor lasting, they were like people in a way which the people of Khand and Harad were not like them. Besides, it was a plot device.
As I said before, history is on my side in this. Even the countries of Europe can't go more than half a century without changing sides. On top of that, Sauron is immortal and has, literally, all the time on the (Middle) Earth to subvert allies.
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Even as fog continues to lie in the valleys, so does ancient sin cling to the low places, the depression in the world consciousness.
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