Social conditions History 1,293 Politics and government 658 Economic conditions 583 Race relations 407 Conditions sociales 392 African Americans 338 更多 ... Social life and customs 253 Ethnic relations 235 Social aspects 197 Histoire 163 Civilization 134 Immigrants 122 Economic history 119 Ethnic identity 111 Conditions économiques 109 Politique et gouvernement 106 Emigration and immigration 104 Description and travel 99 Mexican Americans 91 Black people 79 Indians of South America 72 Minorities 72 Foreign relations 67 Frontier and pioneer life 63 Slavery 63 Community life 62 Civil rights 57 Government relations 57 Social classes 56 少 ...