WHAT HAPPENED IN 1971?

True but Awami League was actually founded by Huseyn Shaheed Suhrawardy

Suhrawardy is considered to be the first populist leader in Pakistan’s history. He is the founder of the Awami League, one of the two major political parties of present day Bangladesh.
http://en.wikipedia.org/wiki/Huseyn_Shaheed_Suhrawardy