Subject
- Armed forces5
- Petroleum industry5
- Second World War (1939-1945)5
- Trade (practice)5
- Administration4
- First World War (1914-1918)4
- Foreign relations4
- International relations4
- Piracy4
- Slave trade4
- Arms control3
- Bilateral relations3
- Economic reform3
- Financial administration3
- Legal procedure3
- National economy3
- Navy3
- Political reform3
- Shipping3
- Treaties3