Explanation: The borders of the states of Palestine and Israel were drawn by a UN committee a few years after WW2. It was the great hope that, whatever the issues of the past, rational discussion and neutral arbitration could resolve future problems without war and without bloodshed.

It, uh, satisfied neither party, immediately started a shooting war, and we're still riding this atrocity carousel to this day.

In the UN's defense, at that point, tensions were so high and everything so utterly fucked by the past ~25 years that there was probably no division they could've offered that would've gotten both parties to lay down their arms.