sikkim was made an integral part of india under which amendment
Sikkim In 1975, the Prime Minister of Sikkim appealed to the Indian Parliament for Sikkim to become a state of India. In April of that year, the Indian Army took over the city of Gangtok and disarmed the Chogyal's palace guards. Thereafter, a referendum was held in which 97.5 per cent of voters supported abolishing the monarchy, effectively approving union with India. India is said to have stationed 20,000â€“40,000 troops in a country of only 200,000 during the referendum.[40] On 16 May 1975, Sikkim became the 22nd state of the Indian Union, and the monarchy was abolished.[41] To enable the incorporation of the new state, the Indian Parliament amended the Indian Constitution. First, the 35th Amendment laid down a set of conditions that made Sikkim an "Associate State", a special designation not used by any other state. A month later, the 36th Amendment repealed the 35th Amendment, and made Sikkim a full state, adding its name to the First Schedule of the Constitution.[42]
Preamble to the Constitution of India The preamble has been amended only once so far. On 18 December 1976, during the Emergency in India, the Indira Gandhi government pushed through several changes in the Forty-second Amendment of the constitution. A committee under the chairmanship of Sardar Swaran Singh recommended that this amendment be enacted after being constituted to study the question of amending the constitution in the light of past experience. Through this amendment the words "socialist" and "secular" were added between the words "Sovereign" and "democratic" and the words "unity of the Nation" were changed to "unity and integrity of the Nation".[5]