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The present-day state of Assam and its predecessor Undivided Assam was colonized by the East India Company and the British Raj over a period of 150 years—beginning with the Goalpara region in 1765 to drawing of the McMahon Line in 1913-1914 when the British consolidated its rule over the present-day Arunachal Pradesh.
1765–1824
Following the Battle of Plassey (1757), the East India Company received the Diwani of Bengal in 1765 from the Mughals, and with it a major part of the Goalpara region. The northern part, called the eastern Duars were still with Bhutan.
References
British annexation of Assam Wikipedia(Text) CC BY-SA