On May 16, 1975, the Kingdom of Sikkim officially became the 22nd state of India. As the nation marks 50 years of this historic integration, it is important to understand the complex interplay of monarchy, politics, and geopolitics that led to Sikkim’s accession.

Also Read: Sikkim Statehood Day 2025

Sikkim Before 1947: A Kingdom with Unique Geopolitical Significance

• Establishment: Sikkim was established as a kingdom in 1642 when three Tibetan lamas crowned Phuntsog Namgyal as its first Chogyal (king).
• British East India Company formalized a protectorate over Sikkim: A formal protectorate was established over Sikkim through the Treaty of Tumlong in 1861, meaning the British had control over it, but it was not officially under their rule, and the Chogyals could continue holding onto power.
  • Treaty of Titaliya (1817): It gave the British authorities several commercial and political advantages in Sikkim. 
  • Calcutta Convention of 1890: It demarcated the border between Sikkim and Tibet, and was signed by Viceroy Lord Lansdowne and Qing China’s Imperial Associate Resident in Tibet.  Lhasa Convention of 1904 affirmed the Calcutta Convention.
• Although Sikkim was never directly ruled by the British, it remained under their influence as a buffer state against China and Nepal.

Post-Independence: India’s Ambiguous Relationship with Sikkim

• Unresolved Status: Sikkim’s status remained uncertain after 1947 due to its pre-existing special relationship with the British.
• Diverse Opinions: Sardar Patel and constitutional advisor B.N. Rau initially proposed that Sikkim should sign the Instrument of Accession, but Nehru was cautious and preferred a non-interventionist approach.
• Standstill Agreement: It was signed to maintain the status quo, with India managing Sikkim’s defence, external affairs, and communication.
• Ethnic diversity in Sikkim: It comprises Bhutias, Lepchas, and Nepalis (the majority), led to early demands for democracy and integration with India by political groups like the Sikkim State Congress (SSC), Praja Mandal, and Praja Sudharak Samaj.
• 1950 Indo-Sikkim Treaty: The Turning Point In 1950, the Indo-Sikkim Treaty formally made Sikkim an Indian protectorate.
  • India assumed control over Sikkim’s defence, external affairs, and communication, while Sikkim retained internal autonomy.
  • Indian influence deepened, as India gained exclusive rights to build infrastructure and issued Indian passports to Sikkimese citizens.

How Sikkim joined India

• Change in political leadership on both sides: Death of Nehru in 1964 and of his successor, Lal Bahadur Shastri, in 1966. For new Indian PM Indira Gandhi, her position weakened after the 1967 general elections that saw her return to power with a reduced majority in the Lok Sabha.
  • Chogyal’s Ambitions: Then Chogyal Tashi Namgyal died in 1963, and Maharaj Kumar Thondup succeeded him, planning to leverage this period of change to seek an independent status for Sikkim.
• Strategic Pressure: This was also after the India-China war of 1962, where India lost. It made it all the more important to contain skirmishes between Indian and Chinese troops on the Sikkim border.
• Growing anti-monarchy protests in 1973: It led to the royal palace being surrounded by thousands of demonstrators. Chogyal was forced to request Indian military assistance to restore order.
• Tripartite agreement was signed between: The Chogyal, Government of India, and major Sikkimese political parties.
  • This agreement laid the groundwork for political reforms, including elections and curtailing the king’s powers.
• 1974–75: Referendum, Abolition of Monarchy, and Integration
  • In 1974: Elections were held, and Kazi Dorji’s Sikkim Congress won a clear majority. A new Sikkimese Constitution was adopted, limiting the monarchy to a titular role.
  • In 1975: A referendum was conducted in which over 97% voted to abolish the monarchy and merge with India.
  • Indian Parliament swiftly passed the 36th Constitutional Amendment, formally recognizing Sikkim as the 22nd state of India.
    • President Fakhruddin Ali Ahmed gave assent, and the merger came into effect on May 16, 1975.

Conclusion

Sikkim’s integration into India was not a simple act of annexation but the result of complex negotiations, shifting geopolitics, internal democratic aspirations, and strategic necessity. The case of Sikkim offers important lessons in statecraft, regional diplomacy, and the balance between autonomy and national unity.

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