Foreign relations -- Politics and government -- 8 History -- 6 World politics -- 6 World War, 1914-1918 -- 3 National security -- 2 National socialism -- 2 more ... Psychological aspect 2 Public opinion -- 2 Strategic aspects 2 Unification, 1990 2 American -- 1 Archival resources -- 1 Attitudes -- 1 Bibliography -- 1 Civilization 1 Cold War 1 Communication in politics 1 Communication in politics -- 1 Congresses -- 1 Defenses 1 Diplomacy 1 Diplomacy -- 1 Economic conditions -- 1 Foreign public opinion -- 1 Foreign relations 1 Geopolitics -- 1 German reunification question (1949-1990) 1 Great powers 1 Heads of state -- 1 less ...