choice of nationality; choice of citizenship
Legal term referring to the act of selecting one's nationality, often in the context of dual citizenship or naturalization.
In Japan, dual citizens must choose their nationality by age 22.
The procedure for choosing nationality is done at the Legal Affairs Bureau.
帰化 refers to naturalization (acquiring a new nationality), while 国籍選択 is the act of choosing between existing nationalities.
二重国籍 is dual citizenship, the status that often leads to the need for 国籍選択.
Compound of 国籍 (nationality) and 選択 (choice, selection). A straightforward modern legal term.