Following conflicting promises and agreements during WWI, in particular McMahon–Hussein Correspondence and Balfour Declaration, as well as a power vacuum following the collapse of the Ottoman Empire led to a series of diplomatic conferences and treaties (Treaty of Sèvres, San Remo conference, Paulet–Newcombe Agreement) which convened with continued armed struggle between the great powers, their proxies, and Arab elements that were part of the Arab Revolt. Following the Battle of Maysalun the Transjordan area east of the valley become a no man's land and the British, who directly controlled the area west of the valley, chose to avoid any definite connection between the two areas. Following the Cairo Conference (1921) and meetings with Abdullah bin Hussein it was agreed that he would administer the territory east of the Jordan River, Emirate of Transjordan. The area west of the Jordan river was allocated in 1922 to the Mandatory Palestine under British Administration. The Jordan river, in the middle of the Jordan valley, was the border between these two entities. This agreement split the Jordan valley, which during Ottoman times was under a single administration, to two distinct entities.
