Sikkim became the 22nd State of India Vide Constitution(36,h Amendment) Act 1975. The Act provides that the Legislative Assembly of Sikkim shall consist of not less than thirty two members and that "the Assembly of Sikkim formed as a result of the elections held in Sikkim in April, 1974 with 32 members elected in the said elections (herein after referred to as the sitting members) shall be deemed to bsthe legislative Assembly of the State of Sikkim duly constituted under the Constitution."

Sikkim is situated at the North East of the union and has a geographical area of 7096 kms only having a population of 6.7 lakhs and 40 thousand. It was a tiny Himalayan kingdom once ruled by the hereditary monarchy for about 3 centuries from 17 century A.D. In 1950 the kingdom became a protectorate of the Government of India vested with autonomy in its internal affairs while its defence, communications and external relation under the responsibility of the protector .The kingdom finally opted to become full fledged State of the Indian Union with effect from 26 April, 1975 vide the Constitution 36th Amendment Act 1975 with special provision laid for the State under article 371(F) of the Constitution of India.

First Assembly

The First Sikkim Assembly formed through the election held in 1974 with 32 members is deemed to be the First Legislative Assembly of Sikkim duly elected under the Constitution of India. Out of the total 32 seats, 15 seats were reserved forNepalese of Sikkimese origin and 1 seat for Sangha. Sikkim Congress led by Kazi Lhendup Dorjee won 31 seats and one seat went in favour of Sikkim National Party. Kazi Lhendup Dorjee was elected leader of the House and became the first Chief Minister of Sikkim.

Second Assembly

The second Assembly was constituted in 1979. The Representation of the People (Amendment) Act, 1979 abolished the reserved seats for the Nepalese of Sikkimese origin and provided seats in the Assembly as under: 12 reserved seats for Bhutia-Lepcha, 2 seats for Scheduled Castes, 1 seat for Sangha and the rest of the 17 seats were declared as general seats. The parly position at the formation of the Assembly was : Sikkim Janata Parishad � 18, Sikkim Congress 9, Sikkim Prajantra Congress 1, Independent 1 and vacant 2 seats. Sikkim Janata Parishad which secured absolute majority in the House elected, Shri N.B. Bhandari as the Leader of the House.

But in May 1984, the then Government led by Shri N.B. Bhandari was dismissed by the then Governor Shri I.H. Talyarkhan and Shri Bhim Bahadur Gurung was appointed as Chief Minister of Sikkim with effect from the forenoon of 11th May, 1984. Shri Bhim Bahadur Gurung served as Chief Minister of State of Sikkim till 24 May, 1984. President rule was imposed in the State of Sikkim with effect from 25th May, 1984 vide Notification No 6(21)Home/84/l dated 25,h May, 1984.

Third Assembly

The third Assembly was Constituted in March, 198ffThe party at the time of formation of the Assembly was: Sikkim Sangram Parishad-30, Congress (I)- 1 and Independent - 1 Shri N.B. Bhandari. who was the Leader of the House was re-elected the Leader of the House.

Fourth Assembly

The fourth Assembly was constituted in 1989. It was a Mono Party House. All the 32 seats were won by the Sikkim Sangram Parishad led by Shri N.B. Bhandari. Subsequently, the ruling party was fragmented into two groups. A motion of confidence in the Council of Ministers headed by the Chief Minister, Shri N.B. Bhandari was moved by Shri S.K. Pradhan on 17*^ May 1994. The motion was defeated and Shri Sanchaman Limboo was elected as the Leader of the House. He formed a new Congress Government which lasted the remaining term of the fourth Assembly.

Fifth Assembly

In fifth Assembly was constituted in December 1994. Out of 32 seats 19 seats were won by the Sikkim Democratic Front which had contested election for the first time, 10 seats by the Sikkim Sangram Parishad and 3 seats by Congress(I). Sikkim Democratic Front formed a new Government under the leadership of Shri Pawan Chamling.

In 1995, the strength of Sikkim Sangram Parishad was reduced to 3 only because 6 of its members split and formed a separate group and 1 member was expelled.
In September, 1996, the six members separate group led by Shri Ram Lepcha merged with the Sikkim Democratic Front, raising the strength of the ruling party to 25.

Sixth Assembly

The sixth Assembly was constituted in October 1999. Out of 32 seats, 25 seats were won by the Sikkim Democratic Front and 7 seats by the Sikkim Sangram Parishad. The Sikkim Democratic Front formed the Government second time under the leadership of Shri Pawan Chamling.

In August, 2000, another 3 members of Sikkim Sangram Parishad resigned from SSP Legislative party under intimation to the party President and formed a separate group. Thus the strength of Sikkim Sangram Parishad Legislative party reduced to I only with 31 members in the ruling Sikkim Democratic Front Legislative Party in the 32 members House.

Seventh Assembly

The seventh Assembly was constituted in May 2004. Out of 32 seats, 31 seats were won by the Sikkim Democratic Front and 1 seat by National Congress Party. The Sikkim Democratic Front formed the Government under the leadership of Shri Pawan Chamling.

Eighth Assembly

The eighth Assembly was constituted on 22nd May 2009. It was a mono party House. All the 32 seats were won by the Sikkim Democratic Front led by Shri Pawan Chamling. The-'Sikkim Democratic Front formed the Government under the leadership of Shri Pawan Chamling.