The land has been Jewish for 3,500 yrs but you clearly never went far in school
Technically, the region involving Israel, has changed hands multiple times. It started out as Hebrew when they founded Jerusalem. After that, Alexander's Macedonians, then the Romans conquered the region, then it changed hands to the Christians, then to the Muslims and then back to the Hebrews in the 20th century. That said, throughout it all, the Jews have continued living there since Jerusalem was founded and some of their ancestors migrated to other regions and some returned once the state of Israel was formerly recognized by the United Nations.
The problem the Jews are facing is that, per the Quran, after conquering territory from infidels, should the infidels get back their territory, they are to be considered "occupiers" of Muslim land, hence the often heard claim that the Jews are "occupiers."
I doubt that the region will ever really know peace. Religion always has a way of causing hatred and war.