Multiple citizenship, or multiple nationality, is a status in which a person is concurrently regarded as a citizen under the laws of more than one state.
Dual citizenship (being a citizen of two nations), or dual nationality, is by far the most common type of multiple citizenship, as nothing in international law prevents anyone from establishing citizenship in two countries. Some countries do not recognise its citizens as having nationality of any other country, or recognise so only in certain circumstances (e.g. Japan recognises only those of underage nationals). Others may recognise as many nationalities as a citizen has.
The Republic of Ireland extends its citizenship laws to Northern Ireland, which is part of the United Kingdom. Therefore, most people born in Northern Ireland (who are usually British citizens) may, if they wish, exercise an entitlement to Irish Citizenship by simply performing an action that could only be done by a person holding Irish citizenship, such as applying for an Irish passport. Most people born in Northern Ireland may hold either a British passport or an Irish passport or both. See Irish nationality law and British nationality law.
Although being a citizen of more than one country can be helpful as it affords two or more passports, it is prudent to realise that each citizenship carries responsibilites. This may bring about problems in conscription, as well as allegiance to more than one state. A dual citizen is subject to travel restrictions, embargoes and sets of laws issued by multiple governments governing one's behaviour domestically and while travelling abroad. Also, as a drawback peculiar to a few countries such as the U.S., citizens are obligated to pay taxes in both the country of origin and the actual country of residence. However, many countries and territories have contracted treaties or agreements of avoiding double taxation. For example, as of 2005, Hong Kong has already contracted 33 agreements that address double taxation or its avoidance. In extreme cases, such as when the countries of citizenship are at war with each other, a dual citizen's international status can be very complicated.
The number of multiple citizens is large and increasing. Millions of people in the world are now citizens of more than one country. The number of multiple citizens is going to increase rapidly as people become ever more mobile, living, marrying and having children in multiple countries over the course of their lives.
After 9/11, the security issue was raised of persons with multiple citizenship travelling under different names - having passports under their old and new names from different countries - and using one kind of passport to exit a country, while travelling on another passport in a different name abroad, and not disclosing this travel upon return. Legislation is being prepared in Canada to end this practice, and to identify persons travelling abroad under different names and passports, and identify security threats from such individuals.
It brings important personal opportunities and responsibilities. As a citizen of a country, you have the opportunity to live there, go to school, work, get medical care, have children, buy property, and retire. There may be agreements to allow freedom of movement to other countries, as in the European Union. (Although it takes just permanent residency to enjoy some of these benefits.) There may also be responsibilities connected with citizenship, such as potential mandatory military service.
Example 2: A person born to American parents in the United States who moves to the United Kingdom may, after five years of legal residence (or three years if married to a British citizen) become a British citizen, and therefore will hold dual British/US citizenship.
Example 3: A child is born in Canada to British born parents. The child is entitled to dual citizenship at birth. Lex sanguinis applies for his British citizenship through his blood relationship with his parents, and lex soli applies for his Canadian citizenship because of his birth on Canadian soil.
Example 4: A British citizen also holds European Union and Commonwealth of Nations citizenship. In addition, most UK citizens born in Northern Ireland are also entitled to citizenship of the Republic of Ireland.
Human migration | Nationality law
Doppelte Staatsangehörigkeit | Double nationalité | Kettős állampolgárság | 重国籍 | Dupla-nacionalidade
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"Multiple citizenship".
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