Commerce 695 History 253 Economic conditions 58 Foreign relations 44 Politics and government 42 Colonies 37 Description and travel 35 more ... Slave trade 31 Slavery 31 Histoire 27 Esclaves 25 Tariff 25 Commerce--Philadelphia--19th century 23 Railroads 23 Commercial policy 22 Finance, commerce, confiscations, etc 22 Indians of North America 22 Shipping 19 Harbors 18 Commerce--Philadelphia--18th century 17 Finance 17 Merchants--Pennsylvania--Philadelphia--18th century 17 Periodicals 17 Directories 14 Business enterprises 13 Industrie et commerce 13 Industries 13 Politique et gouvernement 13 Commerce--West Indies--18th century 12 Diplomatic relations 12 Sources 12 Relations extérieures 11 Interstate commerce 10 Merchants 10 Transportation 10 West Indies--Commerce 10 African Americans 9 China--Commerce 9 Commerce--18th century 9 Commerce--19th Century 9 less ...