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The two states that have the highest concentration of Mexican  Americans is California and Texas. The two states have 61 percent  of Mexican American population.
The 5.0 million undocumented immigrants made up about 1.9 percent of the total U.S. population, with the highest percentages in California, the District of Columbia, and Texas. In the majority of. states, undocumented residents comprise less than 1 percent of the population. Mexico is the leading country of origin, with 2.7 million, or 54 percent, of the population. The. Mexican undocumented population has grown at an average annual level of just over 150,000 since. 1988.