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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.
And from 1990 to 2000, the number of people who claimed Mexican ancestry almost doubled in size to 31,789,483 people. Those with Mexican ancestry are most common along the Southwestern border of the United States and is largest ancestry in Los Angeles, Houston, Phoenix, San Diego, Dallas and San Antonio.