There's both. There are Jews who left before the war for economic or religious regions but also those who left because of rising anti-semitism (which caused their low economic conditions) and unequal rights but I was referring to those who got expelled or fled for their lives after the start of the 1947-1948 conflict.
While you have some history right you have it wrong. They weren;t demanding the Palestinians to be part of Israel. They didn't want an Israeli state and when they went to war with Israel they kicked out the Jews or enhanced discriminatory conditions so much they felt they had to leave.
This is sort of unrelated. Lebanon war happened because of Hezbollah and Iran potential conflict is because of its leadership vitrol towards Israel combined with nuclear ambitions and support of terror.
While these states might be adverse to Israel and hate/hurt their jewish populations its not entirely related.
Why?
From 1948-1970 800,000-1,000,000 Jews were expelled or forced to flee to Israel. That number actually is larger than the number of Palestinian refugees.
http://en.wikipedia.org/wiki/Jewish_...sh_.22Nakba.22 (Decent background)
And the difference is these people have become part of Israel as citizens because Israeli gave a **** what happened to them. The Arab nations took no responsiblity for the Palestinains and made them remain in refugee camps in Syria and Lebanon and Jordan untill this very day.
From 1948-1967 Jordan controlled the West Bank and yet didn't make the Palestinians citizens, Egypt had Gaza and kept them excluded as well.
We never hear about these issues though when discussing the reasoning for the conditions in Palestinian areas.
I'm not saying Israel is blame free but its neighbours are certainly largely at fault for this conflict by repeatedly going to war, turning down peace and not helping the Palestinians themselves. Arafat also screwed the Palestinians multiple times with his fanatical leadersip, corruption and lack of desire to really make peace. The Palestinians could have had a state multiple times already and have turned it down. Hopefully, Abas is serious now with his attempts to restart talks.