Apart from the rule of Agha Mohammad Khan, the Qajar rule is characterized as a century of misrule. The inability of Qajar Iran's government to maintain the country's sovereignty during and immediately after World War I led to the British directed 1921 Persian coup d'état and Reza Shah's establishment of the Pahlavi dynasty. Reza Shah, became the new Prime Minister of Iran and was declared the new monarch in 1925.