Dated events associated with this case. Each event is a shared record: the same event appears identically wherever it is relevant.
· Administrative change
Following a House of Assembly recommendation in March 1971 and Michael Somare's election as Chief Minister in the July 1972 general election, Papua New Guinea achieved internal self-government on 1 December 1973.
Significance here: The intermediate stage of self-government that preceded full independence.
· Constitutional change
The Constituent Assembly rejected a proposal to make Papua New Guinea a republic on 5 June 1975, and formally adopted the Constitution on 15 August 1975, a month before independence.
Significance here: The constitutional settlement adopted shortly before independence, retaining the monarchy.
· Declaration
The Papua New Guinea Independence Act, 1975 withdrew all Australian sovereignty over Papua New Guinea with effect from 16 September 1975, the date nominated by Papua New Guinea's own House of Assembly, ending Australia's administration under the earlier League of Nations mandate and UN Trusteeship Agreement over the Territory of New Guinea.
Significance here: The Act that ended Australian sovereignty and established Papua New Guinea as an independent state.
· Recognition
The Security Council unanimously recommended Papua New Guinea's admission to the United Nations on 22 September 1975, and the General Assembly admitted it on 10 October 1975.
Significance here: Formal international recognition of Papua New Guinean statehood shortly after independence.
Dates show their real precision. Approximate or uncertain dates are labelled and never converted into an exact day.