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In both the historic record and the popular imagination, the story of nineteenth-century westward expansion in America has been characterized by notions of annexation rather than colonialism, of opening rather than conquering, and of settling unpopulated lands rather than displacing existing populations.

Using the territory that is now New Mexico as a case study, Manifest Destinies traces the origins of Mexican Americans as a racial group in the United States, paying particular attention to shifting meanings of race and law in the...