Tariff 373 Protectionism 78 Protection 51 Free trade 42 Free trade and protection 41 Law and legislation 33 Commercial policy 25 more ... Commerce 21 History 19 Economic conditions 11 Politics and government 11 Agriculture 9 Taxation 9 Iron industry and trade 7 Nullification (States' rights) 6 Tariff bill 6 Finance, Public 5 Wool industry 5 Commercial law 4 Currency question 4 Customs administration 4 Revenue 4 Economic aspects 3 Economic policy 3 Finance 3 Industry, Trade, and Tariffs--19th century 3 Internal revenue 3 Labor 3 Manufactures 3 Manufacturing industries 3 Protectionnisme 3 Slavery 3 States' rights (American politics) 3 Sugar trade 3 Tariff bills 3 Working class 3 Auctions 2 Book industries and trade 2 Drawbacks 2 Industrial promotion 2 less ...