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- Causes2,582
- World War, 1914-19182,581
- Politics and government531
- Foreign relations467
- History230
- Diplomatic history137
- War96
- World politics65
- Eastern question (Balkan)62
- Peace47
- Civilization46
- World War (1914-1918)44
- Pangermanism42
- Franz Ferdinand, Archduke of Austria, 1863-191433
- World War, 1939-194531
- William II, German Emperor, 1859-194126
- Influence25
- Neutrality25
- Treaty of Versailles25
- Economic aspects23