Commerce 728 History 263 Economic conditions 69 Foreign relations 46 Politics and government 45 Description and travel 39 Colonies 37 more ... Slave trade 33 Slavery 33 Histoire 32 Esclaves 27 Tariff 25 Commercial policy 24 Commerce--Philadelphia--19th century 23 Railroads 23 Finance, commerce, confiscations, etc 22 Indians of North America 22 Harbors 20 Economic history 19 Shipping 19 Merchants--Pennsylvania--Philadelphia--18th century 18 Commerce--Philadelphia--18th century 17 Finance 17 Periodicals 17 Politique et gouvernement 15 Conditions économiques 14 Diplomatic relations 14 Directories 14 Industrie et commerce 14 Business enterprises 13 Commerce--West Indies--18th century 13 Industries 13 Relations extérieures 12 Sources 12 West Indies--Commerce 12 Descriptions et voyages 11 Commerce--19th Century 10 Interstate commerce 10 Merchants 10 Transportation 10 less ...