The price in the United States would be unaffected. Oil is a global market, and the law of supply and demand governs. As it is, the United States gets most of its oil from the Americas (produced in the US, or in Canada, Mexico or Venezuela). The Saudis try to keep the price down for long term economic reasons, and if Israel were in the same place, the Israelis would as well. Control of the Israeli oil would probably be firmly in the hands of the Israeli socialists, which would be bad for frum Jews.
If Palestine had been oil rich in 1947, it probably would today have a Governor appointed by either the British or the Americans. One major factor for Israeli independence was the lack of any “plus” to owning Eretz Yisrael, enough to justify the high cost of occupying it.