I will assume for a moment that you are truly seeking information and not simply baiting. This reply of yours makes me wonder.
Facts are valid if they can be verified independently no matter where they are posted.
Go to any Islamic site.They reference nothing other than another muslim's opinion. They never provide references which are neutral or official government statistics prior to 1948.
After 1948 I would never believe even official muslim government statistics.
If you can get your hands of a first edition of the Encyclopedia Britannica, for instamce, look up "mahomet" and "mahomedanism". Long before the concept of "Zionism" was created.
"From Time Immemorial" by Joan Peters is the definitive book on your question. She set out to prove the palestinian position by lengthy and thorough scholarship research, and was honest enough to acknowledge that the opposite was proven by the record: The muslims had no such claim to the land.
Begin with the fact that to the extent that it went, 85%+ of the entire region belonged to the Turkish Empire (government lands) and that empire lost a war (and the area) in 1917.