Economic aspects Defenses -- 5 Emigration and immigration -- 4 National security -- 4 Politics and government -- 2 Aliens, Illegal -- 1 Appropriations and expenditures 1 more ... Arms race 1 Cities and towns -- 1 Creative ability -- 1 Economic aspects -- 1 Economic conditions 1 Economic policy -- 1 Immigrants -- 1 Insurgency 1 Intellectual capital -- 1 Military policy -- 1 Military weapons 1 Municipal finance -- 1 Municipal services -- 1 Post-Cold War 1 Technological innovations -- 1 less ...