Dominion of Ceylon February 1948, with an amended constitution taking effect on the same date. Independence was granted under the Ceylon Independence Act 1947. Military treaties with the United Kingdom preserved intact British air and sea bases in the country; British officers also continued to fill most of the upper ranks of the Ceylon Army. Don Senanayake became the first Prime Minister of Ceylon. Later in 1948, when Ceylon applied for United Nations membership, the Soviet Union vetoed the application. This was partly because the Soviet Union believed that the Ceylon was only nominally independent, and the British still exercised control over it
Prime Minister of Bangladesh by political instability and economic difficulties. The nascent democratic institutions foundered in the face of military intervention in 1958, and the government imposed martial law between 1958 and 1962, and again between 1969 and 1971. Between 1947 and 1971 it was intermittently governed by Governors and Chief Minister of East Pakistan. The modern office of Prime Minister was established following the declaration of independence of East Pakistan with the Provisional Government of Bangladesh on 10 April 1971, of which Tajuddin Ahmad became the first Prime Minister of Bangladesh. Since the adoption of the current Constitution of Bangladesh in 1972 the