Re: 1971 War
There were economic grievances which were not addressed, but again the issue that boosted bengali nationalism from the earlier days was language issue. How much we try to say that the issue was resolved 15 years before 1971, the bitter memories remained in minds of Bengali leaders. Even they had monuments like Shuhda Yadgar at Dhaka university to remind that what was done to them during language movement.
So to say that language issue did not play any role in coming years is naive enough and only supported by those who have no respect for others languages.