If that were true (it isn't), there would be no Jewish homeland (not state) in Palestine today.:
Balfour Declaration - Wikipedia.
"The Balfour Declaration was a public statement issued by the British government in 1917 during the First World War announcing its support for the establishment of a 'national home for the Jewish people' in Palestine, then an Ottoman region with a small minority Jewish population."
Got it?
Israel was established in Palestine.
Cutting and pasting from wiki leaves you at a disadvantage.
What you cut and paste from wiki doesn't identify that the loosely defined geographic area you call 'Palestine' was, for more than a thousand years before WW1, a Vilayet of Syria, ruled by the Ottoman Empire. There was never any sovereign territory of any 'Palestinian' entity. So, do some more wiki cutting and pasting and identify for us when your imagined ''Magical Kingdom of Pallyland'' ever existed.