Economic conditions Population Social conditions History 29 Ethnic relations 13 Hispanic Americans 10 Race relations 8 more ... Social change 7 Migration, Internal 6 Minorities 6 Demography 5 Research 5 Social classes 5 Cities and towns 4 Quality of life 4 Working class 4 Agriculture 3 Care 3 Economic aspects 3 Education 3 Emigration and immigration 3 Environmental aspects 3 Government policy 3 Households 3 Intergenerational relations 3 Natural resources 3 Older people 3 Politics and government 3 Poor 3 Public welfare 3 less ...