The region you are referring to is East Pakistan, which was geographically separated from West Pakistan (now simply Pakistan) by over a thousand miles of Indian territory. Following a long-standing struggle for autonomy and due to various political, economic, and linguistic factors, East Pakistan declared independence on March 26, 1971. This led to the Bangladesh Liberation War, which ultimately culminated in the creation of the independent nation of Bangladesh on December 16, 1971. The war resulted in significant loss of life and considerable humanitarian issues, and it marked a pivotal moment in South Asian history.
New state of Pakistan consisted of two separate areas over a thousand away. Later broke out from Pakistan and gots it's independence in 1971
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