"So the nations of Lebanon, Syria, Iraq, and Jordan are no more valid than Israel is." "All set up by the Mandate Powers." beardedbruce @8:09 AM today.

More to this--
The Mandates set by the League of Nations in the Middle East were
Iraq - British
Palestine - British
Syria - French
Lebanon - French

The French mandates evolved into independent countries in 1946.
Iraq, in which the Hashemi family of Arabia was installed as rulers gained full independence in 1932.

Which brings us back to Palestine. The British made promises to two groups for independent states, Jews and Arabs, fore homelands in Palestine. In 1923 the area of Palestine east of the Jordan River was split off as the Arab homeland. BUT the Brits did not choose a local Arab as ruler. The Brits brought into Transjordan a non Palestinian from Iraq, another branch of the Hashemis (which had expected to rule Iraq) as a consolation for British perfidy. Transjordan (as Jordan) became fully independent in 1946.

Perhaps because there was no Palestinian leadership allowed in the country consisting of Palestinian population, and because of anti-Jewish sentiment and pogroms in Palestine from the 1920s to the 1940s, the Palestinians recognize Jordan as the Palestinian homeland.