Once upon a time, Pakistan has two parts history of which goes back to 1947 when the region of Bengal under the British Empire was partitioned into East and West. Entire India was divided between Muslims and Hindus in 1947, Muslim majority districts of Bengal favoured the Partition of India after approving the June 3rd Plan presented by the Viceroy of India Lord Earl Mounbatten, and merged with the new province of East Bengal of the Dominion of Pakistan. From 1947 until 1954, the East Bengal was an independent administrative unit which was governed by the Pakistan Muslim League led by Nurul Amin.
In 1955, the Bengali Prime minister Muhammad Ali Bogra devolved the province of East Bengal and established the state as East Pakistan with Dhaka its state capital. During this time, the 1954 elections were held which saw the complete defeat of Pakistan Muslim League led by Nurul Amin by the nexus of Communist Party. Awami League gained the control of the East Pakistan after appointing Huseyn Suhrawardy for the office of Prime minister. The economic disparity, impression that West Pakistan despite being less populated than East Pakistan was ruling and prospering at its cost further popularize the Bengali nationalism. The support for state autonomy grew when Awami League introduced the Six point movement in 1966, and participated with full force in the 1970 general elections in which the Awami League had won and secured the exclusive mandate of East-Pakistan.
After the general elections, President General Yahya Khan attempted to negotiate with both Pakistan Peoples Party and Awami League to share power in the central government but talks were failed when President Yahya Khan authorized an armed operation to attack the Awami League. As response to this operation, the Awami League announced the declaration of independence of East Pakistan on March 26, 1971 and began an armed struggle against the Pakistan, with India staunchly supporting Awami League by the means of providing arm ammunition to its guerrilla forces.
East Pakistan's culture was influenced by the Communism in neighbouring India. In 1954, the Communist Party had brutally defeated the Pakistan Muslim League and had major influence in poor mass of the East Pakistan. The East Pakistan initially allied with Soviet Union where the tendency of communism was far more greater than the West. East Pakistan had an area of 147,570 km2 bordering India on three sides and the Bay of Bengal to the South. East Pakistan was one of the largest provincial states of Pakistan, with the largest population, largest political representation, and sharing the largest economic share. A nine month long war ended on December 16 of 1971, when the Pakistan Armed Forces overran in Dhaka, ultimately signing the instrument of surrender which resulted the largest in number of prisoners of war since World War II. Finally on December 16, 1971, East Pakistan was officially disestablished and was succeeded as the independent state of Bangladesh.