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After the destruction of Morgoth, I don't think evil was ever strong enough to defeat the West by might alone. It needed to corrupt them to gain the victory.
Apart from the lack of men power that has been noted due to plague etc we have to take into account exactly who Arnor was fighting for the most part. It was not the Witch King that destroyed Arnor, but the civil wars for me. Just look at how the Civil War in Gondor destroyed the capital city. It was probably the Numenoreans themselves that found ways to destroy the fortresses and cities of Arnor. Think what happened to Osgiliath and then remember than Minas Morgul was going to be completely destroyed. Once Arnor had sufficiently destroyed themselves, they became easy pickings for the Witch-King.
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