One of the largest ethnic sub-groups in the United States consists of the Mexican-Americans. According to the 1960 census, approximately 87 percent of the estimated total Spanish surname group of 3,800,000 resided in the Southwest. The largest concentrations were in California and Texas; nonetheless, in New Mexico Spanish-surname people comprised forty percent of the total population of the state (Burma, 1960).
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Anderson et al. (1971) studied this question.
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