Self-determination
In 1947, India gained independence from the British Empire. The empire was in decline but adapted to these circumstances by creating the British Commonwealth—since 1949 the Commonwealth of Nations—which is a free association of equal states. As India obtained its independence, multiple ethnic conflicts emerged in relation to the formation of a statehood during the Partition of India which resulted in Islamic Pakistan and Secular India. Before the advent of the British, no empire based in mainland India had controlled any part of what now makes up the country's Northeast, part of the reason for the ongoing insurgency in Northeast India. In 1971 Bangladesh obtained independence from Pakistan.
Independence Day (India)
The new viceroy, Lord Mountbatten, advanced the date for the transfer of power, believing the continuous contention between the Congress and the Muslim League might lead to a collapse of the interim government. He chose the second anniversary of Japan's surrender in World War II, 15 August, as the date of power transfer. The British government announced on 3 June 1947 that it had accepted the idea of partitioning British India into two states; the successor governments would be given dominion status and would have an implicit right to secede from the British Commonwealth. The Indian Independence Act 1947 (10 & 11 Geo 6 c. 30) of the Parliament of the United Kingdom partitioned British India into the two new independent dominions of India and Pakistan (including what is now Bangladesh) with effect from 15 August 1947, and granted complete legislative authority upon the respective constituent assemblies of the new countries. The Act received royal assent on 18 July 1947.