Reason Behind The Decline Of Arnor And The Rise Of Gondor.

[Andsigil]

Originally Posted by Formendacil

Let's not go painting Arnor as a barren wasteland, though--comparable to Greenland in Eric the Red's day.

That wasn't my intention. But Eriador/Arnor didn't enjoy the natural barriers behind which Gondor endured.

Just looking at the map Gondor seems one, tough nut to crack. Combine that with the climate and rivers, and it seems no wonder that it was able to last so long.