Economic aspects History 37 Agriculture 21 Economic conditions 21 Emigration and immigration 19 World War, 1914-1918 19 Slavery 16 more ... Immigrants 9 Social aspects 9 Aspect économique 8 Politics and government 8 Foreign workers 7 World War, 1939-1945 7 Histoire 6 Political aspects 6 Commerce 5 Finance 5 Race relations 5 War 5 African Americans 4 Economics 4 Social conditions 4 Agriculture and state 3 Causes 3 Colonies 3 Consumption (Economics) 3 Cotton growing 3 Economic policy 3 Families 3 Food supply 3 Labor and laboring classes 3 Rural conditions 3 Slave labor 3 Social life and customs 3 Statistics 3 Tariff 3 15.85 history of America 2 Amerikaanse Vrijheidsoorlog 2 Amerikanische Revolution 2 Automation 2 less ...