The Bangladesh Liberation War of 1971 was triggered by political and economic disparities between East and West Pakistan, culminating in violent oppression of Bengalis following the Awami League's electoral victory. West Pakistani military operations led to horrific human rights abuses, resulting in millions of deaths and mass migration to India. The conflict ended with India's military intervention, leading to Pakistani surrender and the Shimla Agreement in 1972 which established peace and diplomatic recognition of Bangladesh.