The number of illegal immigrants in the United States, after peaking at 12 million in 2007, fell to about 11.1 million in 2009, the first clear decline in two decades, according to a report published Wednesday by the Pew Hispanic Center.

The reduction came primarily from decreases among illegal immigrants from Latin American countries other than Mexico, the report found. The number of Mexicans living in the United States without legal immigration status did not change significantly from 2007 to 2009. Some seven million Mexicans make up about 60 percent of all illegal immigrants, still by far the largest national group, the Pew Center said.

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