<P> Multiple citizenship, dual citizenship, multiple nationality or dual nationality, is a person's citizenship status, in which a person is concurrently regarded as a citizen of more than one state under the laws of those states . There is no international convention which determines the nationality or citizen status of a person . Citizenship status is defined exclusively by national laws, which can vary and can conflict . Multiple citizenship arises because different countries use different, and not necessarily mutually exclusive, criteria for citizenship . Colloquial speech refers to people "holding" multiple citizenship, but technically each nation makes a claim that a particular person is considered its national . </P> <P> Some countries do not permit dual citizenship . This may be by requiring an applicant for naturalization to renounce all existing citizenship, or by withdrawing its citizenship from someone who voluntarily acquires another citizenship, or by other devices . Some countries do not permit a renunciation of citizenship . Some countries permit a general dual citizenship while others permit dual citizenship but only of a limited number of countries . </P> <P> Most countries that permit dual citizenship still may not recognize the other citizenship of its nationals within its own territory, for example, in relation to entry into the country, national service, duty to vote, etc . Similarly, it may not permit consular access by another country for a person who is also its national . Some countries prohibit dual citizenship holders from serving in their military, on police forces or holding certain public offices . </P> <P> Up until the late 19th century, nations often decided who they claimed as their citizens or subjects, and did not recognize any other nationalities they held . Many states did not recognize the right of their citizens to renounce their citizenship without permission, due to policies that originated with the feudal theory of perpetual allegiance to the sovereign . This meant that people could hold multiple citizenships, with none of their nations recognizing any other of their citizenships . Until the early modern era, when levels of migration were insignificant, this was not a serious issue . However, when non-trivial levels of migration began, this state of affairs sometimes led to international incidents, with countries of origin refusing to recognize the new nationalities of natives who had migrated, and when possible, conscripting natives who had naturalized as citizens of another country into military service . The most notable example was the War of 1812, triggered by British impressment of American seamen who were alleged to be British subjects into naval service . </P>

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