Israel occupied the West Bank and the Gaza Strip by military force in 1967. The land at the time of occupation did not belong to the modern State of Israel and was internationally recognised to be controlled by Jordan and Egypt. There is no need to demonstrate that a Palestinian Nation or a Palestinian State owned or controlled the land. It was the military seizure of the land which was not part of the State of Israel before the Six Day War, a war which Isreal initiated, which makes the land occupied. According to treaties and conventions which the State of Israel signed in good faith prior to the Six Day War, land seized in a war of aggression cannot be legally incorporated into the seizing state. The State of Israel initiated combat with Egypt and Egypt was in a defensive treaty with both Jordan and Syria at the time of the attack. Thus an attack against one treaty member was an attack against all three treaty members. Because the State of Israel initiated the war against Egypt and its defensive allies, it was the aggressor. As the aggressor it is forbidden by international laws and conventions, which the State of Israel agreed to, to either settle or annex this occupied territory.
The only way the State of Israel could legally get this land is by having it voluntarily ceded to the State of Israel. That can only happen if the last legally controlling and sovereign power to "own" the land does so willingly. The last legally controlling power recognised by international law was the British Empire when the land was in the British Mandate. So the ball is back in the UK's court and it could just as easily cede the land to the Palestinian Nation, making it a state.
The State of Israel is in breach of international law and should be severely punished until it stops breaking the international laws it has agreed to follow. Boycotts, divestment and sanctions which still recognise the right of the State of Israel to exist within its pre-1967 borders are needed and states, organisations, companies and individuals should strongly consider putting the State of Israel into economic Coventry until it ends its claims and attempts to annex the Occupied Territories, Gaza and the Golan Heights. These territories may be held militarily by the State of Israel in order to deny the land to hostile states or non-state actors, but they cannot be settled nor annexed and the State of Israel, as the occupying power, must protect civilian lives, welfare and property while the land remains occupied.
Cheers and be well.
Evilroddy.