Canaanites and Philistines were there "first". The Children of Israel took the land as led by Moses and Joshua.
What does "first" really mean? Who gets to define "first?"
The Neanderthals were there first. If they can find some Neanderthals, they would have the best claim.
I don't know where there are any Neanderthals now...but maybe Democratic campaign offices would be a good place to start looking for some.