>> Jewish people lived in that region first.

I'm going to skip over the obvious assertion that they weren't- Cainanites were in the promised land when they arrived - but instead focus on the "here first" doctrine.

Because if "here first" is the primary source of political legitimacy then that argument extends to lots of places. It would require that Texas should be part of Mexico, that current govts in Australia, New Zealand and Canada are illegitimate, that all whites in South Africa should be disenfranchised, that most of Europe needs to redraw borders.

In other words, appealing to the political boundaries of a period thousands of years ago is not quite the killer argument it might appear to be.

(It does however support Greenlanders in their fight against US rhetoric. )