During the 19 years from Israel’s victory in 1948 to Israel’s victory in the Six-Day War, all that remained of the UN’s partitioned territory to the “Arabs” of British Mandatory Palestine were the West Bank, under illegal Jordanian sovereignty, and the Gaza Strip, under Egyptian rule. Never during these 19 years did any Arab leader anywhere in the world argue for the right of national self-determination for the Arabs of these territories. A “Palestinian” nation and “Palestinian” people had not yet been invented.
God gave the land in dispute to Israel.
In regards to the land that God has promised Israel, Genesis 15:18 declares, "To your descendants [Abraham's] I give this land, from the river of Egypt to the great river, the Euphrates." God later confirms this promise to Abraham's son Isaac, and Isaac's son Jacob (whose name was later changed to Israel). When the Israelites were about to invade the Promised Land, God reiterated the land promise, as recorded in Joshua 1:4, "Your territory will extend from the desert to Lebanon, and from the great river, the Euphrates — all the Hittite country — to the Great Sea on the west."
With Genesis 15:18 and Joshua 1:4 in mind, the land God gave to Israel included everything from the Nile river in Egypt to Lebanon (North to South) and everything from the Mediterranean Sea to the Euphrates River (West to East). So, what land has God stated belongs to Israel? All of the land modern Israel currently possesses, plus all of the land of the Palestinians (the West Bank and Gaza), plus some of Egypt and Syria, plus all of Jordan, plus some of Saudi Arabia and Iraq. Israel currently possesses only a fraction of the land God has promised.
The nation of Israel is God’s prophetic time-clock. Jesus stated that when we see certain things happen concerning the nation of Israel, we should know His return is near.