When Sharif Hussein's son Emir Feisel arrived to claim Damascus, Syria, the French chased him out. So the British installed him on the Iraqi throne. When the other son, Emir Abdullah, turned up in Amman, British Prime Minister Winston Churchill, dining in a Jerusalem hotel, reportedly drew on a napkin the borders of a new Emirate of Trans-Jordan, encompassing wasteland vaguely claimed by Syrians, Saudis and Iraqis.

Later, as Sharif Hussein (who wanted the Caliphate after Ataturk had abolished it) proved obdurate to the British viewpoint, Britain let Ibn Saud and his Wahhabis hound him out of Mecca. Britain also denied Kemal Ataturk's new Turkish republic the oil-rich Kurdish areas of Mosul and Kirkuk, now in northern Iraq. To thwart Germany posing a danger to India via the Berlin-Basra railroad, the British had earlier propped up oil-rich Kuwait, traditionally ruled by Ottoman pashas in Basra. This throttled Iraqi access to the Persian Gulf. Iraq became somewhat (though not fully!) reconciled to an independent Kuwait only in 1961.

By 1917 Britain's Balfour Declaration had also promised a homeland for Jews in Palestine. European Jews began emigrating to Palestine, and the trickle became a flood with the rise of anti-Semitic policies in Nazi Germany and elsewhere in Europe. After World War II, the state of Israel, carved out of British Palestine, was not recognized by the Arabs. The 1948 Arab-Israeli war allowed Israel to expand its area, while Jordan annexed the West Bank and Egypt took over Gaza. In the Six-Day War of 1967, Israel captured the West bank and Gaza. Thus were laid the foundations for most of the problems of the region.