History 65 Social conditions 36 Emigration and immigration 28 Social aspects 28 Mexican Americans 27 In literature 17 Literature 17 more ... Ethnic relations 15 History and criticism 15 Political aspects 15 Ethnic identity 13 Border security 12 Noncitizens 11 American literature 10 Illegal immigration 10 Immigration enforcement 10 Economic conditions 9 Economic history 9 Intellectual life 9 Mexican American authors 9 Violence 9 Border crossing 8 Indians of North America 8 International relations 8 Mexicans 8 Relations 8 Civilization 7 Immigrants 7 Diplomatic relations 6 Foreign relations 6 less ...