Prior to 1948 a Palestinian could have been an Arab or a Jew. And neither Arabs nor Jews controlled the land or their own national futures; the land was ruled by Britain, and previous to that, the Ottoman Turks for centuries. Both Arabs and Jews had legitimate claims, and rather then being asked "to give half your land", you (the Arabs of Palestine) were offered for the first time in history your own state - provided you agreed that the Jews got the same. But, you rejected that compromise and went to war.
First refugees travelling on Hungarian bus arrive at Austrian border (Reuters)
from the article: Abbas: Arab world was wrong to reject 1947 Partition Plan