 The Chittagong Hill Tracts, which had a 97% non-Muslim population (mostly Buddhist), was awarded to Pakistan by the Boundary Commission due to it being inaccessible to India and to provide a substantial rural buffer to support Chittagong, a major city and port; advocates for Pakistan forcefully argued to the Bengal Boundary Commission that the only approach was through Chittagong.As a result of these mandates, the Mountbatten Plan and Radcliffe Line established East Bengal as a province of the newly formed Dominion of Pakistan in August 1947.Sir Khawaja Nazimuddin, a former Prime Minister of Bengal, was the first Chief Minister of East Bengal after partition.