Since Pre-historical Sapiens Immigration
Immigration is moving from one place to another. 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 or political asylum. Immigrants are people who obtain legal status marked, at a minimum, by some form of residence permit that regulates the terms of their employment. Some, but by no means all, foreign workers and expatriates seek and reachin the state where they work.
Immigrants are different from the in that the latter does not have legal status in the country in which s/he works. 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 later 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.
For legalization you will need:
You will need a permanent home
You will need a work visa
You will need health insurance
All good employment agencies provide care to these questions.
