Eastern Bengal and Assam
Eastern Bengal and Assam (Bengali: পূর্ববঙ্গ ও আসাম; Assamese: অসম ও পূর্ববঙ্গ ) was a short-lived province of British India created through the Partition of Bengal in 1905. It constituted of eastern portion of the erstwhile Bengal Presidency, including modern-day Bangladesh and Indian states of Assam, Meghalaya, Mizoram, Nagaland and Tripura.
Eastern Bengal and Assam was separated from West Bengal, Bihar and Orissa on 16 October 1905, with Dhaka as capital.  A number of princely states, including the Koch Bihar and Twipra Kingdom , were under the authority of the provincial governor. According to the British government, the partition was necessary for administrative purposes of governing a territory as large as France. However, the partition provoked popular uproar across Bengal, and was seen as by many Bengali Hindus as an attempt to divide and rule the region due to the rise of Bengali nationalism.
It was annulled in 1911 following a sustained mass protest campaign. The two parts of Bengal were reunited and a new partition based on language followed, Oriya and Assamese areas separated to form separate administrative units: Bihar and Orissa Province was created to the west, and Assam Province to the east.
Lieutenant Governors of East Bengal and Assam
From 1905 to 1912, the province had a Liutenant Governor heading the provincial government.
- Encyclopedia Britannica, "Eastern Bengal and Assam" https://en.wikisource.org/wiki/1911_Encyclop%C3%A6dia_Britannica/Eastern_Bengal_and_Assam
- David Gilmour, Curzon: Imperial Statesman (1994) pp 271-3