for: Immigration (CA)

Immigration refers to 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.

As a political term

Immigration is a modern phenomenon. It owes its existence to the needs of an ever more intensely integrated global capitalist economy to have people move around for the purpose of work, for reproduction of labor power (studies, particularly higher and more specialized forms of knowledge) or political asylum across the borders of, some believe, an increasingly obsolete inter-state system. 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. Immigrants are different from the undocumented labor force in that the latter does not have legal status in the country in which s/he works. (There can be a host of complex reasons for lack of legal status: lack of interest on part of the worker, the state's refusal to grant such permits to categories of foreign workers, institutional racism, etc.) Not all undocumented workers are, strictly speaking, illegal: Because of the complex history of global migrations, several powerful states, such as the United States, Canada, etc. have had legal systems in which work without explicit consent of the state has fallen through legal "cracks." Both immigrants and undocumented workers differ from tourists as the latter do not engage in income earning activities in the countries they visit, so their economic impact is restricted mainly to consumption and environmental consequences. Seasonal labor migration is often treated in the press and in political rhetoric as a form of immigration.

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).

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 global volume of immigration has been strikingly low in relative terms. The International Integration and Refugee Association estimated a mere 175 million international migrants in 2005, under 3 percent of the global population.Fact: date=January 2009 Contrast that to the average rate of globalization (the proportion of cross-border trade in all trade), which exceeds 20 percent.