I'm of the opinion there's never a grand plan.
The fledgling new UN was probably excited to solve All World Problems and thought they'd bang out this Middle East thing. British Palestine? That won't do, let them have their own state. Also let the Jews have their own state nearby, not any bigger. Job well done.
Damn, based, dude.
(That's why you needed the time machine.)
Wait, I just registered you. I think I was drunk at the time. Or caffeinated.
In any event, welcome!
(I do think that an alt-history treatment of New Israel of Palm Beach would be freakin' hilarious. The jokes would write themselves.)