The Independence of Bangladesh was declared in the year 

The correct answer is 1971

Key Points

• The Bangladesh Liberation War of 1971 was a revolution and armed conflict sparked by the increase of the Bengali nationalist and self-determination movement in then East Pakistan.
• The war resulted in the independence of Bangladesh from West Pakistan.
• East and West Pakistan weren't only separated geographically, but they differed in language, culture, etc.
• East Bengal was Muslim Muslim-dominated region while the west was Hindu-dominated.
• In 1948, Jinnah declared that Urdu would be the official language which led to widespread protests and the Language Movement began.
• Bengalis were deprived of every aspect of administration and military.  Though East Pakistan had more population than the West yet received lower budget allotments.
• In 1970 Cyclone Bhola caused floods and lakhs of individuals died in East Pakistan, but the government failed to provide adequate relief. 
• Again they refused to acknowledge Mujibur Rahman’s win in the 1970's Election.
• This led to civil disobedience and a call for independence in Dhaka and on 23 March 1971 flag of Bangladesh was raised for the primary time.
• The Indo-Pak war of 1971 liberated Bangladesh.

Additional Information 

• On 26 March 1971, Bangladesh was proclaimed as an independent nation by Sheikh Mujibur Rahman, which is celebrated as their Independence Day.
• Mukti Bahini was a Bengali military force in East Pakistan formed by Sheikh Mujibur Rahman.