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Well one reason is also that wolves from Angmar and beyond invaded Eriador during the Long Winter (I think) or the Fell Winter. Which were forever a threat in that region, and maybe also Trolls and Orcs went in to Eriador every now and then to find meat and plunder.
About the about the depopulation don't forget the Great Plague that killed hundreds of thousands, if not millions of people in Arnor, Gondor, the kingdom of Rhovanion, and elswhere.
Lastly about the "haunting". I kind of figured if there was a haunting it was by Wights like in the Burrow-downs, and just the simple fact that the land had been ravaged by Angmar it would have the eerie/evil feeling about it like the Dead Marshes, the Paths of the Dead, and Moria.
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