Arnor- Designed For Failure?

[Belegorn]

Originally Posted by Ivriniel

I never understood why, after Arvedui and Earnil, why Aragorn's ancestor was not encouraged to take up, if not the High Kingship, then the rule of the realm of Arnor. I never understood why the kingdom was not rebuilt.

I'm not sure if the Dúnedain of the south were ready yet to embrace an heir of Isildur and the Rangers were powerless at this point. Arnor was done, "for the Dúnedain were now few and ALL the peoples of Eriador diminished." [Appendix A; The North-kingdom and the Dúnedain]