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|Kingdom of Sikkim|
Anthem: Drenjong Silé Yang Chhagpa Chilo 
Why is Sikkim Blooming So Fresh and Beautiful?
Historical map of Sikkim in northeastern India
|Phuntsog Namgyal (first)|
|Palden Thondup Namgyal (last)|
|Legislature||State Council of Sikkim|
• Treaty of Titalia signed
• Palden Thondup Namgyal forced to abdicate
• Merger with India
|16 May 1975|
|Today part of||India|
The Kingdom of Sikkim (Classical Tibetan and Sikkimese: འབྲས་ལྗོངས། Drenjong), earlier known as Dremoshong (Classical Tibetan and Sikkimese: འབྲས་མོ་གཤོངས།, official name until 1800s), was a hereditary monarchy from 1642 to 16 May 1975 in the Eastern Himalayas. It was ruled by Chogyals of the Namgyal dynasty.
In the mid-18th century, Sikkim was invaded by Nepal (then the Gorkha Kingdom) and was under the Gorkha rule for more than 40 years. Between 1775 and 1815, almost 180,000 ethnic Nepalis from Eastern and Central Nepal migrated to Sikkim. After the British colonisation of India, however, Sikkim allied itself with British India as they had a common enemy – Nepal. The infuriated Nepalese attacked Sikkim with vengeance, overrunning most of the region including the Terai. This prompted the British East India Company to attack Nepal in 1814, resulting in the Anglo-Nepalese War. The Sugauli Treaty between Britain and Nepal and the Treaty of Titalia between Sikkim and British India resulted in territorial concessions by Nepal, which ceded Sikkim to British India.
In 1975, allegations of discrimination against Nepali Hindus in Sikkim led to resentment against the Chogyal. Their instigation led to Indian Army personnel moving into Gangtok. According to Sunanda K. Datta-Ray of The Statesman, the army killed the palace guards and surrounded the palace in April 1975.[dead link]
After disarming the palace, a referendum on the monarchy was held, in which the Sikkimese people overwhelmingly voted to abolish the monarchy, and the new parliament of Sikkim, led by Kazi Lhendup Dorjee, proposed a bill for Sikkim to become an Indian state, which was promptly accepted by the Government of India.
In culture and religion, Sikkim was linked closely with Tibet, from which its first king migrated, and Bhutan, with which it shares borders. The presence of a large ethnic Nepali population, mainly from eastern and central Nepal, also leads to cultural linkages with Nepal.