Zionism's ONLY goal was to create Jewish nation state, to be able to defend themselves against anti-semites. If there was another suitable location Israel would have been created elsewhere. In fact, forefathers of Zionism did seriously consider locations other than Palestine. The fact that Jews were exiled from this land 2000 years ago (and they were) is an interesting historical detail, but it is not the reason for creation of modern Israel.
UN: Gaza could be 'uninhabitable' by 2020 if trends continue (AP)