Subject
- Diplomacy86
- Treaties61
- Bilateral relations52
- First World War (1914-1918)40
- International relations39
- Concessions31
- Foreign relations29
- Boundaries26
- Imperialism24
- Sovereignty24
- Frontiers21
- Railways21
- Arms traffic18
- Trade (practice)18
- Mesopotamian Campaign (1914-1918)17
- Slave trade17
- Military occupation16
- Boundary disputes15
- Colonial administration15
- Loans15