Dershowitz apparently selectively forgot UNSCR 242 passed in 1967 regarding status of occupied territories.
Pres Obama has not one-sidedly changed anything but Mr Trump has. With this action he has singlehandedly stopped the peace process from ever succeeding and begun the previously nefarious scheme to annex Palestine to satisfy Jewish extremists.
Let's see. Annexed territory and Palestinians have no Israeli rights. I think that will do it.