Politics and government -- 13 European Union 3 Foreign relations -- 3 Economic integration 2 History -- 2 Boundaries 1 Citizenship -- 1 more ... Defenses 1 Diplomatic history 1 European Federation 1 European cooperation 1 Foreign relations 1 German reunification question (1949-1990) 1 Group identity -- 1 Human geography -- 1 Iraq War, 2003 -- 1 Iraq War, 2003- 1 Military policy 1 National security 1 National security -- 1 North Atlantic Treaty Organization 1 Operation Allied Force, 1999 1 Peace 1 Political culture -- 1 Political geography 1 Regional planning -- 1 Regionalism -- 1 Relations -- 1 Right-wing extremists -- 1 Social conditions 1 less ...