Stamp showing both the East and west divisions of Pakistan Before the secession of Bangladesh. On March 25th 1971, West Pakistan began a civil war to subdue the democratic victory of East Pakistanis. This began the war between the Pakistani military and the Mukhti Bahini. The resulting refugee crisis led to the intervention by India, eventually leading to the surrender of the Pakistani Army. East Pakistan suffered a genocide of its Bengali population. East Pakistan became the independent state of Bangladesh on December 16, 1971. The term West Pakistan became redundant.