Shugaba Janar Yahya Khan, wanda ya san halin da ake ciki na siyasa a Pakistan, ya sanar da shirye-shiryen gudanar da zabukan kasar baki daya a shekarar 1970, ya kuma ba da Dokar Tsarin Mulki mai lamba 1970 (LFO No. 1970), wanda ya haifar da gagarumin sauyi a yammacin Pakistan.An narkar da shirin Unit Unit, wanda ya baiwa larduna damar komawa tsarinsu kafin 1947, kuma an bullo da tsarin kada kuri'a kai tsaye.Koyaya, waɗannan sauye-sauyen ba su shafi Gabashin Pakistan ba.Zaɓen dai ya ga jam'iyyar Awami League mai fafutukar fafutukar maki shida, ta yi nasara da gagarumin rinjaye a Gabashin Pakistan, yayin da jam'iyyar Zulfikar Ali Bhutto ta Pakistan Peoples Party (PPP) ta samu gagarumin goyon baya a yammacin Pakistan.Kungiyar musulmin Pakistan masu ra'ayin mazan jiya (PML) ta kuma gudanar da yakin neman zabe a fadin kasar.Duk da cewa jam'iyyar Awami ta samu rinjaye a majalisar dokokin kasar, manyan 'yan kasar ta yammacin Pakistan sun hakura da mika mulki ga wata jam'iyyar gabashin Pakistan.Wannan ya haifar da cikas ga tsarin mulki, tare da Bhutto ta bukaci tsarin raba madafun iko.A cikin wannan tashin hankalin na siyasa, Sheikh Mujibur Rahman ya kaddamar da wani yunkuri na rashin hadin kai a gabashin Pakistan, wanda ya gurgunta ayyukan gwamnati.Rashin nasarar tattaunawar da aka yi tsakanin Bhutto da Rahman ya sa shugaba Khan ya ba da umarnin daukar matakin soji a kan kungiyar ta Awami, lamarin da ya kai ga murkushe masu tsaurin ra'ayi.An kama Sheikh Rahman, kuma shugabancin Awami League ya gudu zuwa Indiya , ya kafa gwamnati mai kama da juna.Hakan ya zarce yakin 'yantar da Bangladesh, inda Indiya ke ba da tallafin soji ga 'yan tawayen Bengali.A cikin Maris 1971, Manjo Janar Ziaur Rahman ya ayyana gabashin Pakistan 'yancin kai a matsayin Bangladesh .