History 78 Slave trade 38 Antislavery movements 31 Slavery 28 Cities and towns 20 Colonies 14 Social conditions 14 more ... Enslaved persons 12 Abolitionists 9 City planning 7 Economic conditions 6 Nobility 6 Politics and government 6 Urbanization 6 British colonies 5 Emancipation 5 Public opinion 5 Sociology, Urban 5 French colonies 4 Manners and customs 4 Middle class 4 Race relations 4 Social classes 4 Social life and customs 4 Upper class 4 Urban policy 4 Aristocracy (Social class) 3 Black people 3 Cities and towns, Medieval 3 Commerce 3 less ...