North Borneo Became Sabah: Joined Malaysia on 16 September 1963

North Borneo ceased to exist as a distinct entity on 16 September 1963, when it joined the Federation of Malaysia along with Malaya, Sarawak, and Singapore (which left in 1965).

Key Points

• Former Name: British Crown Colony of North Borneo (since 1946; previously British North Borneo Company protectorate 1882).
• New Name: Sabah — one of 13 states of Malaysia.
• Agreement: Malaysia Agreement 1963 (MA63) — signed 9 July 1963; effective 16 Sept 1963 (Malaysia Day).
• Special Safeguards (MA63): Control over immigration, land, forestry, agriculture; 20% federal revenue share; religious freedom; native courts; Borneanization of civil service.
• Philippines Claim: Dormant claim over eastern Sabah (based on 1878 Sulu Sultanate lease) — unresolved.

Sabah today: ~4M people, capital Kota Kinabalu, oil/gas, palm oil, tourism (Kinabalu Park, Sipadan), diverse ethnicities (Kadazan-Dusun, Bajau, Murut, Chinese, Malay).