Ayub Khan served as President of Pakistan from 1958 to 1969. He rose to power through a military coup in 1958 and declared martial law. He moved Pakistan from a parliamentary democracy to a presidential system and introduced a new constitution in 1962. Economically, Pakistan experienced rapid growth during Ayub Khan's rule through industrialization and a green revolution. However, political institutions remained underdeveloped. Growing discontent led to mass protests and Ayub Khan's abdication in 1969 as the country plunged into further political turmoil.