It was but international treaties that were signed before the mandate changed all that.
Britain was assigned to the already existing Palestine to render administrative assistance and advice to its citizens.
What international treaties were those?
Have you not told us in the past that External Powers have no business deciding the autonomy and fate of Palestine?
If that is true, then...
Is it not also true that External Powers have no business CREATING something called Palestine?
You can't have it both ways (external authority OK for some things but not for others).
Henceforth, Palestinian nationality was first founded, according to international law, on 6 August 1924. And “treaty nationality in Palestine runs from that date.”139 The Treaty of Lausanne had transformed the de facto status of Palestinian nationality into de jure existence from the angle of international law.140 Meanwhile, the Ottoman Empire ceased to exist.141 Likewise, on 6 August 1924, for the first time ever, international law certified the birth of the ‘Palestinian people’ as distinct from all other peoples.
Among its twenty-seven articles, the 1925 Citizenship Order had three key provisions that shaped the future of PalestineÂ’s inhabitants. One relates to the automatic change of the inhabitantsÂ’ nationality from Ottoman subjects into Palestinian citizens.
Genesis of Citizenship in Palestine and Israel
So you are now saying that a peace treaty that does not even mention Palestine between Turkey on one side and Great Britain, Greece, France et al. Here is the entry from the E.B.
Treaty of Lausanne, (1923), final treaty concluding World War I. It was signed by representatives of Turkey (successor to the Ottoman Empire) on one side and by Britain, France, Italy, Japan, Greece, Romania, and the Kingdom of Serbs, Croats, and Slovenes (Yugoslavia) on the other. The treaty was signed at Lausanne, Switz., on July 24, 1923, after a seven-month conference.
The treaty recognized the boundaries of the modern state of Turkey. Turkey made no claim to its former Arab provinces and recognized British possession of Cyprus and Italian possession of the Dodecanese. The Allies dropped their demands of autonomy for Turkish Kurdistan and Turkish cession of territory to Armenia, abandoned claims to spheres of influence in Turkey, and imposed no controls over TurkeyÂ’s finances or armed forces. The Turkish straits between the Aegean Sea and the Black Sea were declared open to all shipping.
Wikipedia has this to say
Borders[edit]
Adakale Island in River Danube was totally forgotten during the peace talks at the Congress of Berlin in 1878, which allowed it to remain a de jure Turkish territory and the Ottoman Sultan's private possession until the Treaty of Lausanne in 1923 (de facto until Romania unilaterally declared its sovereignty on the island in 1919 and further strengthened this claim with the Treaty of Trianon in 1920.)[10]
The treaty delimited the boundaries of Greece, Bulgaria, and Turkey; formally ceded all Turkish claims on the Dodecanese Islands (Article 15); Cyprus (Article 20);[11] Egypt and Sudan (Article 17); Syria and Iraq (Article 3); and (along with the Treaty of Ankara) settled the boundaries of the latter two nations.[1]
The territories to the south of Syria and Iraq on the Arabian Peninsula which still remained under Turkish control when the Armistice of Mudros was signed on 30 October 1918 were not explicitly identified in the text of the treaty. However, the definition of Turkey's southern border in Article 3 also meant that Turkey officially ceded them. These territories included Yemen, Asir and parts of Hejaz like the city of Medina. They were held by Turkish forces until 23 January 1919.[12][13]
Turkey officially ceded Adakale Island in River Danube to Romania with Articles 25 and 26 of the Treaty of Lausanne; by formally recognizing the related provisions in the Treaty of Trianon of 1920.[1][10]
Turkey also renounced its privileges in Libya which were defined by Article 10 of the Treaty of Ouchy in 1912 (per Article 22 of the Treaty of Lausanne in 1923.)[1]
Why do you LIE when you know the truth is just a click away