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1. From Ottoman subjects into Palestinian citizens Turkish subjects habitually resident in the territory of Palestine upon the 1st day of August, 1925, shall become Palestinian citizens. This is what Article 1, Clause (1) , of the 1925 Palestinian Citizenship Order declared with regard to those persons who formed, according to domestic law, the first ‘Palestinians’.
As already concluded in Chapter III above, the ‘Palestinian people’ had been defined according to international law on 6 August 1924, the date at which the Treaty of Lausanne was enforced. Hence, the just quoted clause was a mere declaration of pre-existing international law. This clause refers to the automatic, or ipso facto, acquisition of Palestinian citizenship by those persons resident in Palestine who had replaced their former Turkish, or Ottoman, nationality. Although the term ‘ipso facto’ is not literally employed, it should be easily understood as the clause is a direct application of Article 30 of the Treaty of Lausanne, 1923, which stated that “Turkish subjects habitually resident in territory which... is detached from Turkey will become ipso facto... nationals...”. Thus, Turkish individuals who were covered by this clause became Palestinians by the operation of law without further action.
https://doc.rero.ch/record/9065/files/these.pdf