In 1971, Pakistan's military dictator Yahya Khan allowed an election to be held, gambling that no party would get a clear majority. He was wrong, because an East Pakistani, ethnic Bengali dominated political party got enough votes to stake its claim to form the federal government in Pakistan. This was opposed by the West Pakistani elite and the West Pakistani dominated military. The relationship between Pakistan's two wings, East Pakistan and West Pakistan had remained turbulent. Former Prime Minister of Pakistan Benazir Bhutto recalls being taught at school in West Pakistan that "East Pakistanis are short, dark and eat rice, whilst West Pakistanis are tall, fair and eat wheat". When the victorious East Bengali political party's right to govern was opposed a civil disobedience movement started in East Pakistan that was quelled by furious genocide of ethnic Bengalis by the West Pakistani dominated Army. Get more about Liberation War of Bangladesh(1971) here.