Commerce 654 History 221 Economic conditions 62 Foreign relations 34 Colonies 33 Politics and government 32 Description and travel 29 more ... Tariff 25 Commerce--Philadelphia--19th century 23 Railroads 23 Finance, commerce, confiscations, etc 22 Commercial policy 21 Slavery 20 Harbors 19 Shipping 19 Indians of North America 18 Merchants--Pennsylvania--Philadelphia--18th century 18 Periodicals 18 Commerce--Philadelphia--18th century 17 Finance 17 Commerce--West Indies--18th century 13 Directories 13 Business enterprises 12 Industries 12 West Indies--Commerce 12 Sources 11 Commerce--19th Century 10 Interstate commerce 10 Transportation 10 African Americans 9 Commerce--18th century 9 Harbor 9 International trade--19th century 9 Shipping--Pennsylvania--Philadelphia--19th Century 9 China--Commerce 8 Canals 7 Causes 7 Economic aspects 7 Law and legislation 7 Manufactures 7 less ...