Palestine as a nation and ‘population’ is relatively recent construct.
1960s you say?
The text of the Sana’a Stele,…:
“I subdued from the bank of the Euphrates, the land of Hatti, the land of Amurru in its entirety, the land of Tyre, the land of Sidon, the land of Humri, the land of Edom, the land of Palstu, as far as the great sea of the setting Sun. I imposed tax and tribute on them.” ~ 800 BC
“The Palestinians are also mentioned in the Nimrud Letters..dated c. 735 BC:
“….I spoke to them in these terms:’Bring down lumber, do your work on it, do not deliver it to the Egyptians or Palestinians or I shall not let you go up in the mountains.” (Concerning getting lumber from the mountain forests of what is now Lebanon)
These are just two examples.