The document summarizes the key causes that led to the separation of East Pakistan and the fall of Dhaka in 1971. The main causes included Hindu influence in the economy, the failure of Muslim League leadership to address East Pakistani concerns, delays in the constitution process that increased tensions, the imposition of a centralized presidential system instead of a more autonomous federal structure, Sheikh Mujeeb's six point agenda that demanded more autonomy, and the power struggle between Zulfikar Ali Bhutto and Sheikh Mujeeb which exacerbated tensions and weakened Pakistan politically. International factors like Soviet support for India and the war between India and Pakistan also contributed to the separation of East Pakistan.