Immediately before independence on 16 September 1975, Papua New Guinea was divided into nineteen provinces and the National Capital District. These provinces corresponded to the "Districts" of the pre-Independence administration of the
Territory of Papua and New Guinea.
The Bougainville issue It had been considered that an independent state with limited resources could ill afford the infrastructure of a two-level quasi-federal governmental structure. However, a
secessionist movement in Bougainville,
whose copper mine provided the largest single source of foreign exchange and whose contribution to the general revenue was crucial to the independent state's economic viability, forced the issue. The Bougainville secession movement declared the
Republic of the North Solomons on 1 September 1975 and the central government very quickly responded by offering provincial status to Bougainville. For the sake of consistency, as there were or had been regional separatist movements in Papua and
East New Britain, provincial status was offered to the other 18 Districts as well. Bougainville continues to be a special case. A renewed secession movement emerged in 1988 and resulted in a violent
military campaign on the island, the closing of the Bougainville Copper Mine with serious financial consequences for the central government, the destruction or running-down of most infrastructure on the island and, ultimately, the total quarantining of the province for a decade. The
Sandline affair of 1997 was a political scandal that became one of the defining moments in Papua New Guinea's history, particularly that of the conflict in Bougainville. The Bougainville secessionists came to terms with the central government in 1997. A constitution was drafted for a more autonomous regional polity within Papua New Guinea with its own president and provisions for a referendum on total autonomy in due course. ==Government==