In East Pakistan the political impasse culminated in 1958 in a violent scuffle in the provincial assembly between members of the opposition and the police force, in which the deputy speaker was fatally injured and two ministers badly wounded. Uncomfortable with the workings of parliamentary democracy, unruliness in the East Pakistani provincial assembly elections and the threat of Baluch separatism in West Pakistan, on October 7, 1958, Mirza issued a proclamation that abolished political parties, abrogated the twoyear -old constitution, and placed the country under martial law. Mirza announced that martial law would be a temporary measure lasting only until a new constitution was drafted. On October 27, he swore in a twelve-member cabinet that included Ayub as prime minister and three other generals in ministerial positions. Included among the eight civilians was Zulfikar Ali Bhutto, a former university lecturer and future leader of Pakistan. On the same day, the general exiled Mirza to London because "the armed services and the people demanded a clean break with the past." Until 1962, martial law continued and Ayub purged a number of politicians and civil servants from the government and replaced them with army officers. Ayub called his regime a "revolution to clean up the mess of black marketing and corruption."

The new constitution promulgated by Ayub in March 1962 vested all executive authority of the republic in the president. As chief executive, the president could appoint ministers without approval by the legislature. There was no provision for a prime minister. There was a provision for a National Assembly and two provincial assemblies, whose members were to be chosen by the "Basic Democrats"--80,000 voters organized into a five-tier hierarchy, with each tier electing officials to the next tier. Pakistan was declared a republic (without being specifically an Islamic republic) but, in deference to the religious scholars, the president was required to be a Muslim, and no law could be passed that was contrary to the tenets of Islam.

The 1962 constitution made few concessions to Bengalis. It was, instead, a document that buttressed centralized government under the guise of "basic democracies" programs, gave legal support to martial law, and turned parliamentary bodies into forums for debate. Throughout the Ayub years, East Pakistan and West Pakistan grew farther apart. The death of the Awami League's Suhrawardy in 1963 gave the mercurial Sheikh Mujibur Rahman--commonly known as Mujib--the leadership of East Pakistan's dominant party. Mujib, who as early as 1956 had advocated the "liberation" of East Pakistan and had been jailed in 1958 during the military coup, quickly and successfully brought the issue of East Pakistan's movement for autonomy to the forefront of the nation's politics.

During the years between 1960 and 1965, the annual rate of growth of the gross domestic product per capita was 4.4 percent in West Pakistan versus a poor 2.6 percent in East Pakistan. Furthermore, Bengali politicians pushing for more autonomy complained that much of Pakistan's export earnings were generated in East Pakistan by the export of Bengali jute and tea. As late as 1960, approximately 70 percent of Pakistan's export earnings originated in the East Wing, although this percentage declined as international demand for jute dwindled. By the mid-1960s, the East Wing was accounting for less than 60 percent of the nation's export earnings, and by the time of Bangladesh's independence in 1971, this percentage had dipped below 50 percent. This reality did not dissuade Mujib from demanding in 1966 that separate foreign exchange accounts be kept and that separate trade offices be opened overseas. By the mid-1960s, West Pakistan was benefiting from Ayub's "Decade of Progress," with its successful "green revolution" in wheat, and from the expansion of markets for West Pakistani textiles, while the East Pakistani standard of living remained at an abysmally low level. Bengalis were also upset that West Pakistan, because it was the seat of government, was the major beneficiary of foreign aid.