Naturalization
Naturalization is the legal act or process by which a non-national of a country acquires the nationality of that country after birth. The definition of naturalization by the International Organization for Migration of the United Nations excludes citizenship that is automatically acquired or is acquired by declaration. Naturalization usually involves an application or a motion and approval by legal authorities. The rules of naturalization vary from country to country but typically include a promise to obey and uphold that country's laws and taking and subscribing to an oath of allegiance, and may specify other requirements such as a minimum legal residency and adequate knowledge of the national dominant language or culture. To counter multiple citizenship, some countries require that applicants for naturalization renounce any other citizenship that they currently hold, but whether this renunciation actually causes loss of original citizenship, as seen by the host country and by the original country, will depend on the laws of the countries involved.
History
The sharp increase in the numbers of refugees following World War I created many stateless persons, people who were not citizens of any state. This included the massive influx of stateless people which followed mass denaturalization and the expulsion of ethnic minorities from newly created nation states in the first part of the 20th century. In some cases, laws for mass naturalization were passed, as naturalization laws had been designed to cater for the relatively few people who had voluntarily moved from one country to another.Reasons
Since World War II, the increase in international migrations created a new category of migrants, most of them economic migrants. For economic, political, humanitarian and pragmatic reasons, many states passed laws allowing a person to acquire their citizenship after birth, such as by marriage to a national – jus matrimonii – or by having ancestors who are nationals of that country, in order to reduce the scope of this category. However, in some countries this system still maintains a large part of the immigrant population in an illegal status. Some countries allow naturalization due to military service.Naturalization is politicized due to the reshaping of the electorate of the country. Some political parties support naturalization to increase the number of voters voting for their party.
Countries without a path to naturalization
and Uruguay are currently the only countries in the world that deny immigrants any path to naturalization. Uruguayan legal citizenship has special characteristics. A person who acquires it retains their nationality of origin, which is determined by Uruguayan law to be that of their country of birth and is therefore immutable. Legal citizens acquire political rights but do not acquire Uruguayan nationality as natural citizens do. According to Uruguayan law, those born in Uruguay or whose parents or grandparents are Uruguayan natural citizens are considered to be Uruguayan nationals.As a result of Uruguay's unusual distinction between citizenship and nationality, legal citizens have encountered problems with their Uruguayan passports at airports around the world since 2015. This is due to recommendations in the seventh edition of Doc. 9303 of the International Civil Aviation Organization, which requires that travel documents issued by participating states include the "Nationality" field. The lack of a naturalization path means that the Nationality field in legal citizens' passports indicates their country of birth, which Uruguay assumes to be their nationality of origin. Many countries do not accept passports issued by a country that declares the holder to be a national of another country. As a consequence, it has severely curtailed legal citizens' exercise of the right to free movement, as their travel abroad is often difficult or downright impossible.
Mass naturalizations
A few rare mass naturalization processes have been implemented by nation states. In 1891, Brazil granted naturalization to all aliens living in the country. In accordance with the 1923 population exchange agreement between Greece and Turkey following the Armistice of Mudanya and end of World War I in Anatolia, Greece rapidly naturalized all Greek, Roman or Orthodox Christian people fled from Turkey after the defeat of Greek Army in Turkey. Reciprocally, the Republic of Turkey naturalized all Turk or Muslim refugees and deportees from the Balkans, Greece and other former regions of the Ottoman Empire during the redemption period. Another massive naturalization process was in favor of Armenian people coming from Anatolia, who went to Syria, Lebanon or other territorries of the former Ottoman Empire. In the 1980s and 1990s Turks and Muslims living in Bulgaria were forced to leave Bulgaria in a massive campaign. The Republic of Turkey accepted almost all refugees and deportees from Bulgaria and naturalized them. A significant refugee from that era was the athlete Naim Süleymanoğlu.Canada instituted a mass naturalization by Act of Parliament with the enactment of the Canadian Citizenship Act 1946.
After annexation of the territories east of the Curzon line by the Soviet Union in 1945, Soviets naturalized en masse all the inhabitants of those territories—including ethnic Poles, as well as its other citizens who had been deported into the Soviet Union, mainly to Kazakhstan. Later on, Germany granted to the ethnic German population in Russia and Kazakhstan full citizenship rights. Poland has a limited repatriation program in place.
In the late 1970s, President Ferdinand Marcos facilitated the mass naturalization of ethnic Chinese in the Philippines.
The most recent massive naturalization case resulted from the Argentine economic crisis in the beginning of the 21st century. Existing or slightly updated right of return laws in Spain and Italy allowed many of their diasporic descendants to obtain—in many cases to regain—naturalization in virtue of jus sanguinis, as in the Greek case. Hence, many Argentines acquired European nationality.
Since the Fourteenth Amendment to the United States Constitution grants citizenship only to those "born or naturalized in the United States, and subject to the jurisdiction thereof", and the original United States Constitution only grants Congress the power of naturalization, it could be argued that all acts of Congress that expand the right of citizenship are cases of mass naturalization. This includes the acts that extended U.S. citizenship to citizens of Puerto Rico, the United States Virgin Islands, Guam, and the Northern Mariana Islands, as well as the Indian Citizenship Act of 1924 which made all Native Americans citizens.
In the eastern Malaysian state of Sabah, mass naturalization also occurred during the administration of United Sabah National Organisation and Sabah People's United Front Muslim-dominated political parties to increase the Muslim population in the territory by naturalising immigrants and refugees from the mainly-Muslim dominated areas of Mindanao and Sulu Archipelago of the Philippines and Sulawesi of Indonesia.
Illegal naturalization
Naturalization can be declared illegal resulting in denaturalization.The mass naturalization of people in occupied territories is illegal under the laws of war. However, there have been many instances of such illegal mass naturalizations in the 20th century.
Summary by country
The following list is a brief summary of the duration of legal residence before a national of a foreign state, without any cultural, historical, or marriage ties or connections to the state in question, can request citizenship under that state's naturalization laws.| Country | Residence requirement | Residence requirement notes | Other notes | Multiple citizenship | Main article | |
 AfghanistannoLaws by countryAustraliaThe Australian Citizenship Act 1973 ended the preferential treatment for British subjects from 1 December 1973. People who became permanent residents from 1 July 2007 must have been lawfully resident in Australia for four years before applying for citizenship by conferral. Those who were present in Australia as permanent residents before 1 July 2007 remain subject to the previous residence requirement.People's Republic of ChinaThe People's Republic of China gives citizenship to people with one or two parents with Chinese nationality who have not taken residence in other countries. The country also gives citizenship to people born on its territory to stateless people who have settled there. Furthermore, individuals may apply for nationality if they have a near relative with Chinese nationality, if they have settled in China, or if they present another legitimate reason. In practice, few people gain Chinese citizenship; as of 2010, China had only 1,448 naturalised Chinese in total.The naturalization process starts with a written application. Applicants must submit three copies, written with a ball-point or fountain pen, to national authorities, and to provincial authorities in the Ministry of Public Security and the Public Security Bureau. Applicants must also submit original copies of a foreign passport, a residence permit, a permanent residence permit, and four two-and-a-half inch long pictures. According to the conditions outlined in the Nationality Law of the People's Republic of China, authorities may also require "any other material that the authority believes are related to the nationality application". FrancePeople who fulfil all of the following criteria can obtain French citizenship through naturalisation:
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