Government policy History 31 Emigration and immigration 27 Prevention 22 Terrorism 21 Foreign relations 14 National security 13 Social aspects 13 Political aspects 11 Drug abuse 10 Social conditions 10 Moral and ethical aspects 9 Politics and government 9 Law and legislation 8 Nuclear weapons 8 Research 8 Security measures 8 Women 8 Immigrants 7 Narcotics, Control of 7 Technological innovations 7 Military policy 6 Automobiles 5 Economic aspects 5 Internet 5 Petroleum industry and trade 5 Race relations 5 War on Terrorism, 2001- 5 Antitrust law 4 Children 4