The Jews never renounced their claim to Israel after they were driven out of Jerusalem by the Romans in ca. AD 71. For 2,000 years, the Jews of the Diaspora welcomed the Holidays with the toast, "Next year in Jerusalem!"
The Jews have had a continuous presence in the land of Israel for more than 3 000 years. Surrounding the word "facts" with quotes as the first commenter does, doesn't make them any less real.
It is not only custom, but international law that land belongs to the victor who has been attacked. The Arabs were unwilling to share any land with the Jews at all, and attacked them immediately after Israel declared statehood in 1948, with the intent of genocide, as they openly stated themselves. They lost, and thereby forfeited any remaining right they may have had to any of the land of Israel.
"Palestine" is an artificial state invented by Nasser and Arafat after the Arabs lost yet another war of attempted genocide in 1967. "Palestine" exists for the sole purpose of discrediting and destroying Israel. The Arab goal has never been about land, "justice", or any of the other pretexts they use to extort pity from naive Western leftists. The Arab goal has always been, and will always be, to kill Jews and wipe Israel from the face of the earth.