International relations World politics Foreign relations 12 War (International law) 9 War 7 Balance of power 6 21st century 5 Forecasting 5 Globalization 5 History 5 International economic relations 5 Security, International 5 Conflict management 3 Diplomacy 3 Encyclopedias 3 Forecasts 3 Geopolitics 3 Military history, Modern 3 Twenty-first century 3 20th century 2 Case studies 2 Periodicals 2 Political violence 2 Regionalism (International organization) 2 Research 2 Strategy 2 Terrorism 2 1989- 1 21th century 1 Addresses, essays lectures 1