Citizenship is the status of a person identified under the law as being a part of a country or region. A person may have multiple citizenships (called second citizenship, dual citizenship)
Multiple citizenship, also called dual citizenship or Second citizenship, is a person's citizenship status, in which a person is concurrently regarded as a citizen of more than one country or region under the laws of those country. There is no international convention which determines the citizen status of a person, which is defined exclusively by national laws, which may vary and can be inconsistent with each other. Dual citizenship arises because different countries use different rule, and not necessarily mutually exclusive, decision for citizenship. Colloquial speech refers to people "holding" second citizenship or second passport but technically each nation makes a claim that this person be considered its national.
Some countries do not permit second citizenship or carrying Dual passport. This may be by requiring an applicant for naturalization to claim all existing citizenship, or by withdrawing its citizenship from someone who voluntarily acquires another passport, or by other devices. Some countries do not permit for renunciation of citizenship. Some countries permit a general dual citizenship while others permit second citizenship but only of a limited number of countries.
Most countries that allow dual citizenship still may not recognize the other citizenship of its nationals within its own territory, for example in relation to entry into your country, national service, duty to vote, etc. Similarly, it may not permit consular access by another region or country for a person who is also its national. Some countries prohibit dual citizenship holders from serving their military force, on police or holding certain public offices.
Countries which Allow Dual Citizenship
The following countries allow the acquisition of Second citizenship:-
Austria Denmark Grenada Latvia Philippines Switzerland Australia Dominica Hungary Lebanon Poland
Bangladesh Ecuador Iceland Lithuania Portugal Thailand Belgium Egypt Iran Macedonia Romania Turkey
BelizeEl Salvador Iraq Malta Russia United Kingdom Brazil Fiji Ireland Mexico Serbia United States of America
Canada Finland Israel Montenegro Spain Vietnam Chile France Italy New Zealand Sri Lanka Western Samoa
Colombia Germany Jordan Pakistan St. Kitts & Nevis Cyprus Greece Kenya Peru Sweden Syria
Countries which Do Not Allow Dual Citizenship
The following countries do not allow the acquisition of Second Passport:-
Brunei Kazakhstan Mauritius Norway Solomon Islands China Kiribati Myanmar Papua New Guinea Venezuela
Indonesia Kuwait Nepal India Saudi Arabia Japan Malaysia Netherlands Singapore