It was. Jews did'nt move there by force but by their own willingness in order to flee from persecution.
Demography changed along the time.
There was time when arab population far exceed jews population there; but there was time jews population compete with arab population there. They were all Palestinian, either jews and arabs.
It is another false claim by Palestinian.
There was barely arab palestinian's property seized by jews palestinian; the jews purchased many private properties from arab palestinian. The rest like desert, lake, mountains, river, etc was public land governed by authority (under british mandate)
Purchase = legal, the new owner pay to the prior owner by willingness, not robbery.
en.wikipedia.org
Therefore it was a normal and legal demography dynamic, not by force unlike what happened during conquest by power in the past (Ottoman, etc).