Immigration is the arrival of new individuals into a habitat or population. It is a biological concept and is important in population ecology, differentiated from emigration and migration.
Definition
The term "immigration" is usually used to mean international immigration. International migration has been split into two types by most governments, based on the UN: long and short term. The United Nations considers a long term international migrant to be
A person who moves to a country other than that of his or her usual residence for a period of at least a year (12 months), so that the country of destination effectively becomes his or her new country of usual residence. From the perspective ... of the country of arrival the person will be a long-term immigrant.— United NationsIt also considers a short term migrant to be
A person who moves to a country other than that of his or her usual residence for a period of at least 3 months— United NationsThis specifically excludes "temporary travel abroad for purposes of recreation, holiday, visits to friends and relatives, business, medical treatment or religious pilgrimage". The UN has also directly linked international immigration into one country with emigration from another.
The modern concept of immigration is related to the development of nation-states and nationality law and/or citizenship law. Citizenship in a nation-state confers an inalienable right of residence in that state, but residency of non-citizens is subject to conditions set by immigration law. The emergence of modern nation-states made immigration a political issue: by imagining its populations, in violation of multi-ethnic, multi-'racial', multi-cultural realities 'on the ground', as homogenous blocks, constituting a nation defined by shared, single ethnicity, 'race' and/or culture. Legal and political restrictions on the presence of foreigners is a highly controversial political theme because such restrictions are introduced and maintained by states whose citizens have had a major, sustained and deeply consequential presence in states other than their own (see: colonialism).
Legal immigrants are people who obtain legal status marked, at a minimum, by some form of residence permit that regulates the terms of their employment (see also expatriates). Some, but by no means all, foreign workers and expatriates seek and reach citizenship in the state where they work. Legal immigrants are different from the undocumented labor force in that the latter does not have legal status in the country in which he or she works. Not all undocumented workers are, strictly speaking, illegal, because of the complex history of global migrations.
Statistics
The International Organization for Migration said there are more than 200 million migrants around the world today. Europe hosted the largest number of immigrants, with 70.6 million people in 2005, the latest year for which figures are available. North America, with over 45.1 million immigrants, is second, followed by Asia, which hosts nearly 25.3 million. Most of today's migrant workers come from Asia.
The United Nations found that, in 2005, there were nearly 191 million international migrants worldwide, 3 percent of the world population. This represented a rise of 26 million since 1990. Sixty percent of these immigrants were now in developed countries, an increase on 1990. Those in less devloped countries stagnated, mainly because of a fall in refugees. Contrast that to the average rate of globalization (the proportion of cross-border trade in all trade), which exceeds 20 percent. The numbers of people living outside their country of birth is expected to rise in the future.
The Middle East, some parts of Europe, small areas of South East Asia, and a few spots in the West Indies have the highest percentages of immigrant population recorded by the UN Census 2005. The reliability of immigrant censuses is, however, lamentably low due to the concealed character of undocumented labor migration. The International Organization for Migration has estimated the number of foreign migrants to be over 200 million worldwide today.
Recent surveys by Gallup found roughly 700 million adults would like to migrate to another country permanently if they had the chance. The United States is the top desired destination country.
Understanding of immigration
General theories behind immigration
One theory of immigration distinguishes between push factors and pull factors. Push factors refer primarily to the motive for emigration from the country of origin. In the case of economic migration (usually labour migration), differentials in wage rates are prominent. If the value of wages in the new country surpasses the value of wages in one’s native country, he or she may choose to migrate as long as the travel costs are not too high. Particularly in the 19th century, economic expansion of the U.S. increased migrant flow, and in effect, nearly 20% of the population was foreign born versus today’s value of 10%, making up a significant amount of the labor force. Poor individuals from less developed countries can have far higher standards of living in developed countries than in their originating countries. The cost of emigration, which includes both the explicit costs, the ticket price, and the implicit cost, lost work time and loss of community ties, also play a major role in the pull of emigrants away from their native country. As transportation technology improved, travel time and costs decreased dramatically between the 18th and early 20th century. Travel across the Atlantic used to take up to 5 weeks in the 1700s, but around the time of the 1900s it took a mere 8 days. When the opportunity cost is lower, the immigration rates tend to be higher. Escape from poverty (personal or for relatives staying behind) is a traditional push factor, the availability of jobs is the related pull factor. Natural disasters and can amplify poverty-driven migration flows. This kind of migration may be illegal immigration in the destination country (emigration is also illegal in some countries, such as North Korea, Myanmar, Zimbabwe, and Somalia).
The main problem with push-and-pull theories is three-fold: first, they state the obvious (i.e., people from poorer places will seek to go to richer ones); second, they are unable to explain the emergence of migrant flows (if push and pull were the only things in existence, people from the poorest countries would migrate to the richest ones, when in reality such flows are well-nigh non-existent); third, they are unable to explain the stability of the emerging patterns of migration (i.e., once a flow from country A to country B is established, it will stay on for a relatively long time, even if the initial conditions that had given the push and pull to the migration are not there any more (as the case of the German case of the Gastarbeiter, or guest worker program shows.
Emigration and immigration are sometimes mandatory in a contract of employment: religious missionaries, and employees of transnational corporations, international non-governmental organisations and the diplomatic service expect, by definition, to work 'overseas'. They are often referred to as 'expatriates', and their conditions of employment are typically equal to or better than those applying in the host country (for similar work).
For some migrants, education is the primary pull factor (although most international students are not classified as immigrants). Retirement migration from rich countries to lower-cost countries with better climate, is a new type of international migration. Examples include immigration of retired British citizens to Spain or Italy and of retired Canadian citizens to the U.S. (mainly to the U.S. states of Florida and Texas).
Non-economic push factors include persecution (religious and otherwise), frequent abuse, bullying, oppression, ethnic cleansing and even genocide, and risks to civilians during war. Political motives traditionally motivate refugee flows—to escape dictatorship for instance.
Some migration is for personal reasons, based on a relationship (e.g. to be with family or a partner), such as in family reunification or transnational marriage. In a few cases, an individual may wish to emigrate to a new country in a form of transferred patriotism. Evasion of criminal justice (e.g. avoiding arrest) is a personal motivation. This type of emigration and immigration is not normally legal, if a crime is internationally recognized, although criminals may disguise their identities or find other loopholes to evade detection. There have been cases, for example, of those who might be guilty of war crimes disguising themselves as victims of war or conflict and then pursuing asylum in a different country.
Barriers to immigration come not only in legal form; natural and social barriers to immigration can also be very powerful. Immigrants when leaving their country also leave everything familiar: their family, friends, support network, and culture. They also need to liquidate their assets often at a large loss, and incur the expense of moving. When they arrive in a new country this is often with many uncertainties including finding work, where to live, new laws, new cultural norms, language or accent issues, possible racism and other exclusionary behaviour towards them and their family. These barriers act to limit intern
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