Who Planned the Sikkim Annexation by India? Sikkim, as we know today, is a beautiful part of the Northeastern region of India. But the history of Sikkim goes back to 1642 when Sikkim was not a part of India and was then an independent Kingdom, ruled by the monarchs. On 16th May 1975, Sikkim became … Continue reading 16th May 1975: The Kingdom of Sikkim and its Annexation with India