After the mandate was terminated , the armed forces of Transjordan entered Palestine . The Security Council adopted a US-backed resolution that inquired about the number and disposition of Transjordan 's armed forces in Palestine . The Foreign Minister of Transjordan replied in a telegram " that neither the UN nor US recognized Transjordan , although they both had been given the opportunity for more than two years . Yet the US had recognized the Jewish state immediately , although the factors for this recognition were lacking . " In explaining to the Security Council why Transjordan 's armed forces had entered Palestine Abdullah said : " we were compelled to enter Palestine to protect unarmed Arabs against massacres similar to those of Deir Yassin . " After capturing the West Bank during the 1948 Arab – Israeli War , Abdullah was proclaimed King of Palestine by the Jericho Conference . The following year , Jordan annexed the West Bank
Deir Yassin
Deir Yassin massacre
History of Jordan