Task: Question Generation
Input (English): After repeated efforts by the Samoan independence movement, the New Zealand Western Samoa Act 1961 of 24 November 1961 granted Samoa independence effective 1 January 1962, upon which the Trusteeship Agreement terminated. Samoa also signed a friendship treaty with New Zealand. Samoa, the first small-island country in the Pacific to become independent, joined the Commonwealth of Nations on 28 August 1970. While independence was achieved at the beginning of January, Samoa annually celebrates 1 June as its independence day.
Output (English): What's the name of the agreement that ended with the start of Samoa's independence from New Zealand?