like i said, jews have always been in israel, but never officially.
once the state was given to them, the arabs got indignant because they wanted their piece of the land as well, so they started a war which they lost. not only did they lose, but they lost so much land that they would have been better off not fighting in the first place.
and then there was the war in 1967, and again they lost more land. now the big debate is about whether or not israel should go back to pre-1967 borders. for many many many years they haven't, but recently they've started disengaging from gaza and the west bank, etc.
and just as israel starts disengaging and going pre-1967, all hell breaks loose.