P F Tinmore, Shusha, et al,
Palestine since 1922 was defined as the Territory under the Mandate.
It is all still Palestine.
Fine. Call it whatever you want to call it. Makes no difference. It was one territory. Then Oslo happened. Oslo changed everything. Oslo, from a legal perspective, gives us two States who have agreed to recognize one another and create a border between them -- the exact placement of which is still under dispute.
(COMMENT)
Israel was formerly territory to which the Mandate Applied.
Israel Sovereignty (territorially) supersedes the meaning of Palestine in every manner. Thus --- the UN was able to replace the PLO designation with "Palestine."
Most Respectfully,
R