Sikkim

A small Himalayan state, once an independent Tibetan kingdom, which was integrated with India by popular vote in 1975. Though Hinduism is now followed by over two-thirds of the population, the influence of Tibetan Buddhism remains strong. According to tradition, Buddhism was introduced here in the 8th century ce by Padmasambhava.

A Dictionary of Buddhism, Oxford University Press, 2003, 2004 (which is available in electronic version from answer.com)