We estimate that 57 percent of the illegal alien population comes from Mexico, 11 percent is from Central America, 9 percent is from East Asia, 8 percent is from South America, and Europe and the Caribbean account for 4 percent. Of all immigrants from Mexico, 55 percent are illegal; for Central Americans it is 47 percent; and it is 33 percent for South Americans. Again these figures do not adjust for undercount of the legal or illegal populations in the CPS. If we did make this adjustment, it would mean that an even larger share of all immigrants from these regions are illegal because the undercount of illegal immigrants is much larger than the undercount of legal immigrants. Although these estimates are consistent with other research findings, including those produced by the federal government, it should be obvious that there is no definitive means of determining whether a respondent in the survey is an illegal alien with 100 percent certainty.
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Unlike in the past, the growth in the immigrant population now accounts for a large share of the increase in the size of the U.S. population. Even during the first decade of the last century, the 3.2 million increase in the size of the immigrant population accounted for only 20 percent of the total increase in the U.S. population. In contrast, the 11.3 million increase in the immigrant population from 1990 to 2000 accounted for 35 percent of U.S. population growth in the 1990s. And the 6.8 million increase in the size of the immigrant population in the last seven years equals 34 percent of U.S. population growth between 2000 and 2007.15 It should noted that the 34 percent does not represent the full impact on population growth in the United States because it includes deaths. Net immigration is the way one measures the impact of immigration on population growth, not the net increase in the size of the immigrant population. To measure the full impact of immigration on population growth it also would be necessary to include births to immigrants.
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Region and Country of Origin
Sending Regions. Table 4 shows the distribution of immigrants by region of the world, with Mexico and Canada broken out separately. Mexico accounts for 31.3 percent of all immigrants, with 11.7 million immigrants living in United States, more than the number of immigrants from any other region of the world. Immigrants from Latin America (Mexico, Central and South America, and the Caribbean) account for the majority of immigrants, with 54.6 percent of the foreign-born coming from these areas. East Asia/Southeast Asia also makes up a significant share of the total, accounting for 17.6 percent of immigrants. This is similar to the combined total for Europe and the Middle East. The importance of the Western Hemisphere, excluding Canada, is even more striking when we look at recent arrivals. Of those who arrived from 2000 to 2007, 58.7 percent are from Latin America.
http://www.cis.org/articles/2007/back1007.htmlMore info here as well:
http://www.dhs.gov/xlibrary/assets/statistics/publications/ill_pe_2006.pdf
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