Economic aspects Emigration and immigration -- 4 Defenses -- 3 National security -- 3 Aliens, Illegal -- 1 Cities and towns -- 1 Creative ability -- 1 more ... Economic aspects -- 1 Economic conditions 1 Immigrants -- 1 Intellectual capital -- 1 Military weapons 1 Municipal finance -- 1 Municipal services -- 1 Politics and government -- 1 Post-Cold War 1 Technological innovations -- 1 less ...