There is a claim that Israel, illegally or otherwise, expanded artificially the municipal boundaries of Jerusalem after the 1967 war. In other words, land-grabbing.
So, what did the United Nations think the borders of the city were?
Well, as of 15 April 1949, we learn here that:
The area of Jerusalem includes the present municipality of Jerusalem together with the surrounding villages and towns, the most eastern of which is Abu Dis, the most southern Bethlehem, the most western Ein Karim (including also the built-up area of Motsa) and the most northern Shu’fat.
And those were the boundaries as per the Partition Plan of November 29, 1947, too.
The map:
Much larger in area than the present-day Jerusalem.
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