1943 de-classified CIA document – it is highly educational – see link below.
This decision was based upon the illogical assumption that the Jews of
Poland or Lithuania had equal rights to Palestine with the Arabs, who
descend from the peoples that inhabited Canaan before the Israelitish
invasion under Joshua. It is noteworthy that the ancient Hebrew
kingdom never was able to hold all Palestine, and that even in the
heights of its prosperity and Solomonic glory, the richer coastal
plain was owned and dominated by its more powerful neighbors. Now the case was to be reversed, and the Jews were to own that which
historically they never possessed.
https://www.cia.goV/readingroom/docs/HUSSEINI,%20AMIN%20EL%20%20%20VOL.%201_0049.pdf