Subject
- Petroleum industry5
- Second World War (1939-1945)5
- Armed forces4
- First World War (1914-1918)4
- Slave trade4
- Trade (practice)4
- Administration3
- Arms control3
- Bilateral relations3
- Economic reform3
- Foreign relations3
- International relations3
- Legal procedure3
- National economy3
- Navy3
- Piracy3
- Political reform3
- Administration of justice2
- Concessions2
- Customs administration2