As the foregoing suggests, any Arab claim to sovereignty based on inherited historical control will not stand up. Arabs are not native to Palestine, but are native to Arabia, which is called Arab-ia for the breathtakingly simple reason that it is the historic home of the Arabs. The terroritories comprising all other "Arab" states outside the Arabian peninsula including Iraq, Syria, Jordan, Lebanon, Egypt, Tunisia, and Algeria, as well as the entity now formally under the Palestinian Authority were originally non-Arab nations that were conquered by the Muslim Arabs when they spread out from the Arabian peninsula in the first great wave of jihad in the 7th century, defeating, mass-murdering, enslaving, dispossessing, converting, or reducing to the lowly status of dhimmitude millions of Christians and Jews and destroying their ancient and flourishing civilizations. Prior to being Christian, of course, these lands had even more ancient histories. Pharaonic Egypt, for example, was not an Arab country through its 3,000 year history.
The recent assertion by the Palestinian Arabs that they are descended from the ancient Canaanites whom the ancient Hebrews displaced is absurd in light of the archeological evidence. There is no record of the Canaanites surviving their destruction in ancient times. History records literally hundreds of ancient peoples that no longer exist. The Arab claim to be descended from Canaanites is an invention that came after the 1964 founding of the Palestine Liberation Organization, the same crew who today deny that there was ever a Jewish temple in Jerusalem. Prior to 1964 there was no "Palestinian" people and no "Palestinian" claim to Palestine; the Arab nations who sought to overrun and destroy Israel in 1948 planned to divide up the territory amongst themselves. Let us also remember that prior to the founding of the state of Israel in 1948, the name "Palestinian" referred to the Jews of Palestine.
In any case, today's "Palestine," meaning the West Bank and Gaza, is, like most of the world, inhabited by people who are not descendants of the first human society to inhabit that territory. This is true not only of recently settled countries like the United States and Argentina, where European settlers took the land from the indigenous inhabitants several hundred years ago, but also of ancient nations like Japan, whose current Mongoloid inhabitants displaced a primitive people, the Ainu, aeons ago. Major "native" tribes of South Africa, like the Zulu, are actually invaders from the north who arrived in the 17th century. India's caste system reflects waves of fair-skinned Aryan invaders who arrived in that country in the second millennium B.C. One could go on and on.
The only nations that have perfect continuity between their earliest known human inhabitants and their populations of the present day are Iceland, parts of China, and a few Pacific islands. The Chinese case is complicated by the fact that the great antiquity of Chinese civilization has largely erased the traces of whatever societies preceded it, making it difficult to reconstruct to what extent the expanding proto-Chinese displaced (or absorbed) the prehistoric peoples of that region. History is very sketchy in regard to the genealogies of ancient peoples. The upshot is that "aboriginalism" the proposition that the closest descendants of the original inhabitants of a territory are the rightful owners is not tenable in the real world. It is not clear that it would be a desirable idea even if it were tenable. Would human civilization really be better off if there had been no China, no Japan, no Greece, no Rome, no France, no England, no Ireland, no United States?
