History of Israel and Palestine
The Mandate for Palestine
The Mandate for Palestine was a "Class A" League of Nations mandate for British administration of the territories of Palestine and Transjordan, both of which had been conceded by the Ottoman Empire following World War I. The mandate was assigned to Britain in April 1920 following France's concession of the previously agreed "international administration" over Palestine; Transjordan was subsequently added to the mandate after the Arab Kingdom in Damascus was toppled by the French. Civil administration began in Palestine and Transjordan in July 1920 and April 1921, respectively, and the mandate was formally in force between 29 September 1923 and 15 May 1948.
The mandate document was based on the principles contained in Article 22 of the Covenant of the League of Nations of 28 June 1919 and of the Supreme Council of the Principal Allied Powers' San Remo Resolution of 25 April 1920. The objective of the system of Class A mandates was to administer parts of the defunct Ottoman Empire "until such time as they are able to stand alone". The border between Palestine and Transjordan was agreed in the mandate document, and the approximate northern border with the French Mandate was agreed upon in the Paulet–Newcombe Agreement of 23 December 1920.
https://en.m.wikipedia.org/wiki/Mandate_for_Palestine
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Mandatory Palestine
Mandatory Palestine[a][1] (Arabic: فلسطين Filasṭīn; Hebrew: פָּלֶשְׂתִּינָה (א"י) Pālēśtīnā (EY), where "EY" indicates "Eretz Yisrael", Land of Israel) was a geopolitical entity established between 1920 and 1923 in the Middle East roughly corresponding to the region of Palestine, as part of the Partition of the Ottoman Empire under the terms of the "Mandate for Palestine".
During the First World War (1914–18), an Arab uprising and the British Empire's Egyptian Expeditionary Force under General Edmund Allenby drove the Turks out of the Levant during the Sinai and Palestine Campaign.[2] The United Kingdom had agreed in the McMahon–Hussein Correspondence that it would honour Arab independence if they revolted against the Ottomans, but the two sides had different interpretations of this agreement, and in the end, the UK and France divided up the area under the Sykes–Picot Agreement—an act of betrayal in the eyes of the Arabs. Further complicating the issue was the Balfour Declaration of 1917, promising British support for a Jewish "national home" in Palestine. At the war's end the British and French set up a joint "Occupied Enemy Territory Administration" in what had been Ottoman Syria. The British achieved legitimacy for their continued control by obtaining a mandate from the League of Nations in June 1922. The formal objective of the League of Nations mandate system was to administer parts of the defunct Ottoman Empire, which had been in control of the Middle East since the 16th century, "until such time as they are able to stand alone."[3]