Palestine, the mythic “land without people for a people without land” was already home to 700,000 Palestinians in 1919.
The standard Zionist position is that they showed up in Palestine in the late 19th century to reclaim their ancestral homeland. Jews bought land and started building up the Jewish community there. They were met with increasingly violent opposition from the Palestinian Arabs, presumably stemming from the Arabs’ inherent anti-Semitism. The Zionists were then forced to defend themselves and, in one form or another, this same situation continues up to today.
The problem with this explanation is that it is simply not true.