[International immigration, a political fact].

"This article retraces the sources of immigration towards Canada and the United States during the post-war period, and paints a picture of the immigration practiced in Western Europe. Dealing with international immigration also means touching on the immigration practices of the receiving countries: their border policies (selection), as well as their policies in the interior (integration)." The political influence of immigration on both the relations between nations and the political situation in receiving countries is examined. (summary in ENG, SPA)