Abolishing the Oath of Allegiance in effect abrogated the 1921 treaty. On 9 September 1914, the Porte unilaterally abrogated the capitulations granted to foreign powers. After successful coups, military regimes have abrogated existing constitutions and promulgated interim charters. President Yahya Khan imposed martial law and the 1962 Constitution was abrogated. In 1819 Buenos Aires enacted a centralist constitution that was soon abrogated by federalists. Yahya subsequently abrogated the 1962 Constitution, dissolved parliament, and dismissed President Ayub's civilian officials. After each successful coup, military regimes abrogated existing constitutions and promulgated new ones. He further abrogated Decree 691 of 1993. He also stated that the Constitution of Pakistan had not been abrogated, but temporarily suspended. Legal experts dispute whether the treaty rights were abrogated by the War of 1812. In October 1958, President Iskander Mirza abrogated the constitution. He abrogated the Cadiz Constitution of 1812 and persecuted anyone who had supported it. The 1962 Constitution was abrogated on 25 March 1969. In the letter he specified this as "never juridically abrogated". In poor health, President Ayub abrogated his own constitution and suddenly resigned from the presidency.