Israel’s founding authority is not from man, but from God:
Genesis 15:18
(18) In the same day Jehovah made a covenant with Abram, saying, I have given this land to your seed, from the river of Egypt to the great river, the river Euphrates,
Numbers 33:50-56:
(50) And Jehovah spoke to Moses in the plains of Moab beside Jordan, at Jericho, saying,
(51) Speak to the sons of Israel and say to them, When you have passed over Jordan into the land of Canaan,
(52) then you shall drive out all those who live in the land from before you, and destroy all their carved images, and destroy all their molded images and pluck down all their high places.
(53) And you shall possess the land, and live in it. For I have given you the land to possess it.
(54) And you shall divide the land by lot by your families. And you shall give the more inheritance to the many; to the few you shall give the less inheritance. Wherever the lot falls out to him; according to the tribes of your fathers you shall inherit.
(55) But if you will not drive out the people of the land from before you, then it will be, those of them whom you let remain shall be goads in your eyes and thorns in your sides, and they shall trouble you in the land in which you live.
(56) And it shall be, as I thought to do to them, so I shall do to you.