1) they have a territory of their own, it`s called Palestine, No they have not. They simple do not own it. 2) i.e., what was left over after Jordan became independent and Israel Declared Sovereignty. It includes Jerusalem/W Bank, Gaza, a big chunk bordering Lebanon and a big chunk bordering Egypt, none of which was ever legally annexed to Israel. They have lost it for not accepting partition and launching a criminal war against Israel. Thir rights to soverignty have to earned again through negotiations. There is however, another way. They could launch another war, maybe this time will be luckier.
from the article: Palestinian PM: Declaration of statehood just a formality