Researchers at the Pew Research Center examined U.S. Census numbers in six states with the largest numbers of undocumented people. California tops that list with about 2.5 million, a pretty big drop from 2007 when about 2.8 million unauthorized residents lived here. But after a few years of decline, the state's undocumented population has been holding steady over the past two years.
Number of Undocumented Immigrants Levels Off
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