long long story, in short, ww2 over, Brittish control the area, hand it over to the UN, its decided to give jews land (they had been migrading there heavily since around 1900), Israel part is created, as soon as that happens war, and another war and war yes and war, oh yeah and more war. No one got around to it to create the second state. And to put it simply, everyone is to blame for the current situation.