The Ayub Khan era marked Pakistan's first military regime and significant political changes from 1958 to 1969, following the failure of the 1956 constitution. Ayub established a new presidential system with a centralized autocratic government under the 1962 constitution, aiming to address previous political inefficiencies but leading to a lack of political legitimacy. Ultimately, his regime faced downfall due to various internal and external pressures, indicating a shift from an administrative state back toward a political one.