Formation of USNO Tun Mohd Hamdan Abdullah was well known as one of the founding fathers of
United Sabah National Organisation which also known as USNO. Together with
Tun Mustapha as the party's first President, Tun Mohd Hamdan, who was elected Deputy President, played a great role in gaining supporters in order to achieve one of its main aims to campaign for independence and self-government for North Borneo. In 1963, Tun Mohd Hamdan made his political debut when he won the Sulaman seat in the Legislative Council after defeating a candidate from
United Pasokmomogun Kadazan Organisation in the first state legislative assembly elections.
Involvements in the state administration In 1962, Tun Mohd Hamdan Abdullah was appointed as Temporary Member of the State Legislative Council. He was reelected in 1964 and 1967. In 1968, he was appointed as Political Secretary to the Minister of Finance. In December 1971, he was appointed as the Director of Sabah Padi Board. As Director of the Board, Tun Mohd Hamdan made important changes to help improve the agricultural irrigation and drainage system in order to increase paddy production.
Governorship of Sabah (1975-1977) On 28 July 1975, Tun Mohd Hamdan was appointed as Sabah's fourth Yang di-Pertua Negara (Governor) to replace Tun Haji Mohammad Fuad Stephens who resigned from the post. Before his appointment to the governorship on 26 July 1975, he resigned as USNO Deputy President. He made the decision to forge closer relationships with the Sabahan people. During his tenure as Yang di-Pertua Negara of Sabah, Tun Mohd Hamdan presided over a series of political conflicts in Sabah which occurred in 1975 between Tun Mustapha and the United Sabah National Organisation (USNO) with Tun Fuad Stephens who had just resigned as Sabah's Yang di-Pertua Negara at that time. Tun Mustapha had resigned as Chief Minister of Sabah in 1975 and was replaced by his deputy,
Mohammad Said Keruak. Tun Fuad Stephens had formed a new political party known as
BERJAYA to achieve his aims in order to topple the USNO Government. This eventually led to the
Sabah state election on 15 April 1976 which brought the end of USNO administration over Sabah and this led to the establishment of a new state government led by Tun Fuad Stephens as the fifth Chief Minister of Sabah. The new administration was short-lived when Tun Fuad Stephens was killed in a
tragic air crash which happened on 6 June 1976. Tun Mohd Hamdan later appointed
Harris Salleh, Deputy Chief Minister under Tun Fuad as the sixth Chief Minister. Tun Mohd Hamdan was a popular governor and state leader throughout his tenure. He liked to tour throughout Sabah on his official visits in order to get closer to the people. As governor, he struggled to improve the living conditions and social welfare of the people, especially farmers and people living in the rural areas. ==Death==