Israel is a sovereign, recognized nation. President Trump did not let Israel do anything. Israel does as it pleases.
Israel only became a state in 1947. This was due to the holocaust. Palestinians were forced from their properties that they had owned for generations. Even now in the West Bank, Palestinian land owners are being forced from their properties for the expansion of Israeli settlements.
Before 1947, all of this area was relatively peaceful.
How would you like it if I came over to your property and forced you out by gun point and resumed your land.