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.
History of Pakistan
On 14 August 1947 Pakistan gained independence. India gained independence the following day. The two provinces of British India: Punjab and Bengal were divided along religious lines by the Radcliffe Commission. Mountbatten is alleged to have influenced the Radcliffe Commission to draw the line in India's favour. Punjab's mostly Muslim western part went to Pakistan and its mostly Hindu/Sikh eastern part went to India but there were significant Muslim minorities in Punjab's eastern section and likewise there were many Hindus and Sikhs living in Punjab's western areas.