The correct answer is 1971.

• On the night of 25th March 1971 Bangladesh get independence from Pakistan.
•  Bangladesh Liberation War 
  • The Bangladesh Liberation War was a revolution and armed conflict sparked by the rise of the Bengali nationalist and self-determination movement in what was then East Pakistan during the 1971 Bangladesh genocide.
  • The war began the Pakistani military junta based in West Pakistan launched Operation Searchlight against the people of East Pakistan on the night of 25 March 1971.
  • The language Movement was started in 1948 meant to assert the rights of the Bengali-speaking population of Pakistan and also for the equal status of Bengali with Urdu, which alone was declared as Pakistan's federal language.
  • After the general elections in Pakistan in 1970, Mujibur Rahman's Awami League won a clear majority. But the military in Pakistan was opposed to him becoming the country's supremo.
  • The military government of Yahya Khan was unwilling to give up power to Mujib Bengali nationalism was on the rise.
  • On the night of 25th March 1971, the Pakistani army started the now-infamous "Operation Searchlight" in which they killed students, intellectuals, and civilians in Bangladesh. Thousands of Bengali women were raped by the Pakistani army. The idea was to brutally crush the Bengali resistance.
  • It commemorates the country's declaration of independence from Pakistan in the early hours of 26 March 1971 by the leader of the Nation Sheikh Mujibur Rahman.