The land was know as the land of Judea, not the land of Jeruselem.
To those familliar with it sure, but what about those who came from there and knew nothing of it except that Jerusalem was their former home? We're talkign 500 years after the fact, living in the New World. BTW, there are many many names for that area by the local of the time, not just the land of Judea. Here are a few: Canaan, Divided Kingdom, Eretz Israel, Israel, Judea, Palestine, Pelesheth, Philistia, Samaria, United Kingdom....