History 135 Social conditions 30 Politics and government 21 Murder 19 Race relations 14 African Americans 12 Political aspects 11 more ... Slavery 10 Social aspects 10 Presidents 9 Enslaved persons 7 Economic conditions 6 Families 6 History and criticism 6 Nationalism 6 Political leadership 6 Women 6 Social life and customs 5 Causes 4 Economic aspects 4 Education 4 Family 4 Foreign relations 4 Group identity 4 Immigrants 4 Imperialism 4 Mental health 4 Merchants 4 Middle class 4 Murderers 4 less ...