I cannot think of a country that did not originally belong to somebody else. England, the saxons; U.S., the native americans; australia, the aborigines.... et al.
Just because in history there were lands that were stolen doesn't justify stealing another. All of these lands should be returned to their original owners.
The land wasn't stolen, it was given to the Jews by the League of Nations, essentially because no other nation wanted the Jews in their respective nations(this included the U.S. at the time, sucks but it's true). So...