The Jews had been buying up and developing the area of Palestine in the 1800's while it was still under the "control" of the Ottoman Empire and long before WW2.
Arab immigration to the once largely deserted area was a direct result of the improvement in living standards and opportunities created by the Jewish development.
Drainage of swamps which removed malaria risk, hydro schemes for water and the planning and building of towns and cities and development of the land for agriculture was all because of the Zionist project.
