The Battle of Grand Gulf was fought on April 29, 1863, during th: The UK has the world's sixth-largest economy by nominal gross domestic product (GDP), and the ninth-largest by purchasing power parity. It is a recognised nuclear state and is ranked fourth globally in military expenditure.[28][29] The UK has been a permanent member of the UN Security Council since its first session in 1946. It is a member of the Commonwealth of Nations, the Council of Europe, the G7, the OECD, NATO, the Five Eyes, AUKUS and the CPTPP.