African Americans 35 Statistics 35 History 31 Geology 28 Economic conditions 17 Emigration and immigration 17 Employment 17 more ... Politics and government 17 Hispanic Americans 16 Population 15 Minorities 14 Bibliography 10 Emigration and immigration law 10 Petroleum 10 Social conditions 10 Coal 9 Education 9 Mexican Americans 9 Ethnic groups 8 Mexicans 8 Mines and mineral resources 8 AIDS (Disease) 7 Communism 6 Foreign relations 6 Geology, Stratigraphic 6 Indians of North America 6 Labor supply 6 Museums 6 Natural gas 6 Race relations 6 Social aspects 6 Anthracite coal 5 Coal mines and mining 5 Congresses 5 Economic aspects 5 Health and hygiene 5 Immigrants 5 Law and legislation 5 Puerto Ricans 5 Refugees 5 less ...