Economic aspects Social aspects 13 History 9 Race relations 6 Capitalism 5 Economic conditions 5 Free trade 5 more ... Globalization 5 Human-animal relationships 4 Imperialism 4 Agriculture 3 Asians 3 Economic integration 3 Emigration and immigration 3 Environmental aspects 3 Public opinion 3 Race identity 3 Stereotypes (Social psychology) 3 Agriculture and state 2 Aims and objectives 2 Automobile industry and trade 2 Automobile industry workers 2 Bird pests 2 Colonization 2 Control 2 Crime prevention 2 Double-crested cormorant 2 Drug control 2 Education, Higher 2 Educational change 2 less ...