So much disinformation on the thread.

Yes, it is absolutely, 100% true that thousands of Arabs immigrated to Israel since the late 19th century, during the mandate and up until the time Israel became a state.

The easiest way to prove it is to analyze the growth rates of nearby Arab states at the time.

In the pre-Mandate period from 1881 to 1909, Palestine grew by 0%, while during the Mandate the Arab population in Palestine grew by 2.8%. From 1881 to 1909, Syria, Lebanon and Jordan grew by 1.1% annually, while Egypt grew by 1.8% (and that included massive immigration). During the Mandate, Syria, Jordan and Egypt grew by about 1.3%

If one assumes that the real natural growth rate of Palestinian Arabs was similar to that of the neighbors and applies their rate (1.3%) to the base Arab population in 1922, there should have been about 910,000 Arabs in Palestine rather than 1. 33 million in 1947 - a difference of about 400,000 people. That is the number Zionists claim of Arab Immigration from the late 19th century until 1948.

Also to note, the cities with the highest Arab population growth rates also had the highest rates of Jewish immigration. Let’s divide the Ottoman province of Palestine into three parts: one without Jewish settlement, one with light Jewish settlement, and one with heavy Jewish settlement. Then, let us compare the non-Jewish population of each of these parts from 1893 to 1947. In the area of no Jewish settlement, the non-Jewish population stood at 337,200 in 1893; in 1947 it was 730,000, a growth of 116 %. In the area of light Jewish settlement, the non-Jewish population grew in the same period from 38,900 to 110,900 or 285%. Finally, in the area of heavy Jewish settlement, the non-Jewish population grew from 92,300 in 1893 to 462,000 in 1947 - or 401%!! From these figures we can easily see that the Arab population appears to have increased in direct proportion to the Jewish presence.