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International law has duly recognized that a state is allowed to provide its citizens with nationality in term of the reserved domain. In other words, each state is capable of acquisition and renunciation of nationality for its own citizens without any kind of intervention made by other states. Hence, whenever there is overlapping criteria governing acquisition of nationality, this leads to the status of dual nationality with the state.
In considering nationality under Thai law, a person acquires nationality by birth according to the principle of jus sanguinis and jus soli; or after birth by marriage or nationalization. Which may cause dual nationality because Thai law does not have provision that prohibit dual nationality.
This article aims to study about dual nationality under the perspective of Thai law where by demonstrating Thai law’s provisions regarding nationality, presenting related problems and facts that still occurs particularly in Thailand. And, giving suggestions to amend Nationality Act, B.E. 2508 for preventing dual nationality by birth and nationalization.
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