When discussing the reasons behind the separation of Bangladesh from India, it is important to consider the historical context of the region. Hostile relations between the two countries in the past were a major factor that ultimately led to the secession of Bangladesh from Pakistan.

One of the key events that triggered the separation was the Bangladesh Liberation War, which took place in 1971. During this time, the people of East Pakistan (now Bangladesh) fought for their independence from West Pakistan (now Pakistan). The atrocities committed by the Pakistani military during this conflict further fueled the desire for independence among the Bangladeshi people.

Another important factor in the separation of Bangladesh from India was the support that India provided to the Bangladeshi independence movement. India played a significant role in training and arming the insurgents in Bangladesh, which helped them in their fight against the Pakistani forces.

Ultimately, the combination of historical tensions between the two countries, the Bangladesh Liberation War, and India's support for the independence movement all contributed to the separation of Bangladesh from India. This separation led to the creation of the independent nation of Bangladesh in 1971.