Key Facts
- Duration
- 1921–1958 (37 years)
- Independence from Britain
- 1932, following Anglo-Iraqi Treaty (1930)
- Population at founding (1928)
- 2.8 million
- Population at end (1958)
- 6.5 million
- First military coup
- 1936, led by Bakr Sidqi
- Arab Federation formed
- 14 February 1958 (dissolved same year)
Imperial Zenith Metrics
Territorial Scale Comparison
Peak area vs modern sovereign states
Historical Trajectory
Phase I: Rise
The Kingdom of Iraq was established on 23 August 1921 in the aftermath of the Ottoman Empire's defeat in World War I, when Britain installed the Hashemite prince Faisal I as king under a League of Nations mandate. Following the 1920 Iraqi revolt, the original mandate plan was replaced by a formally sovereign kingdom under effective British administration, as codified by the Anglo-Iraqi Treaty. Full independence was achieved in 1932.
Phase II: Zenith
After gaining full independence in 1932, Iraq joined the League of Nations and expanded its diplomatic presence, later becoming a founding member of the Arab League in 1945 and joining the United Nations. The kingdom developed nascent state institutions and oil revenues began shaping the economy, though persistent ethnic and sectarian tensions among Sunni, Shia, Kurdish, Assyrian, and Yazidi communities constrained stable governance and social cohesion.
Phase III: Decline
Chronic political instability, beginning with the 1936 Bakr Sidqi coup, plagued the kingdom through multiple subsequent coups and a brief pro-Axis government defeated by Allied forces in 1941. Post-war unrest, including the 1948 Al-Wathbah uprising and Kurdish rebellions, deepened fragility. In July 1958, General Abdul-Karim Qasim led a military coup that overthrew and abolished the Hashemite monarchy, ending the kingdom and establishing the Republic of Iraq.
Notable Imperial Reigns
Selected rulers mapping the empire’s trajectory