History 27 Foreign relations 13 Politics and government 12 Emigration and immigration 7 Social aspects 6 Mexican Americans 4 Political aspects 4 更多 ... Relations 4 Social conditions 4 Social life and customs 4 Spanish language 4 Education 3 Education, Higher 3 Examinations 3 Immigrants 3 Licenses 3 Physicians 3 Political and social views 3 Women 3 African Americans 2 Americanization 2 Civilization 2 Criticism and interpretation 2 Cubans 2 Curricula 2 Description and travel 2 Economic aspects 2 Education, Bilingual 2 Foreign economic relations 2 Gangsters 2 少 ...