Actually Israel had already been a state before the UN Partition vote.
For most Jews, the existence of the state was already a fait accompli. Theodor Herzl, the late-19th century founding visionary of modern Jewish nationalism, had willed it so at the First Zionist Congress, in Basel, Switzerland in 1897 and in 1917, the Balfour Declaration confirmed the right of the Jewish people to a national homeland in Israel Palestine. But for the world, the State of Israel came into being on November 29, 1947, the day the United Nations General Assembly passed the Partition Plan by a two-thirds majority vote. Throngs of people filled the streets in Jerusalem, Tel Aviv and Haifa and in settlements throughout the yishuv with euphoric singing and dancing. The Jews were to be granted their own state, albeit small, and the British mandatory officials were to depart by August 1, 1948.
The next day 5 Arab armies attacked the State of Israel and the Arabs lost against the 3 thousand year old Israel.
Possession of a land constitutes 100% ownership of the land until someone wishes to take it away by war.
No the Jewish people would not have been better served by living in other people's lands instead of retaining their own eon long land. History teaches lessons and the Jews have at times been welcomed in all lands around the world but eventually they are expelled or killed when these countries came into bad times. It was always easier to blame their Jewish citizens. Hitler demosntrated that no country was willing to take Europes Jews so more than six million were gassed and cremated for being born into a harmless religion. Very nice.
If I wish to take the United States or France for my country, I will have to attack these countries with my armies and make me the owner of these lands.