I thought Israel came about because of the Balfour Declaration of 1917 but that it wasn’t enforced completely until after WWII?
The Balfour Declaration was an important trigger, but its effect was in actuality limited because the British did everything not to keep their word.
The UN vote gave de jure legitimacy to Israel as did US and USSR recognition but at the end of the day Israel actually came about because the Jews there declared themselves a State and as much as they tried- even with British help- the Arabs failed to kill it in its cradle.