The Hashemite Kingdom of Iraq was the Iraqi state located in the Middle East from 1932 to 1958. It was founded on 23 August 1921 as the Kingdom of Iraq, following the defeat of the Ottoman Empire in the Mesopotamian campaign of the World War I. Although a League of Nations mandate was awarded to the United Kingdom in 1920, the 1920 Iraqi revolt resulted in the scrapping of the original mandate plan in favour of a formally sovereign Iraqi kingdom, but one that was under effective British administration. The plan was formally established by the Anglo-Iraqi Treaty. The population of the Kingdom was 2.8 million at the founding in 1928, and by the end of the Kingdom in 1958 it was 6.5 million.
The role of the United Kingdom in the formal administration of the Kingdom of Iraq was ended in 1932, following the Anglo-Iraqi Treaty of 1930. Then officially a fully independent kingdom, it underwent a period of turbulence under its Hashemite rulers throughout its entire existence. Establishment of Sunni Islam in Iraq was followed by Assyrian, Yazidi and Shi'a unrests, which were all brutally suppressed. In 1936, the first military coup took place in the kingdom, as Bakr Sidqi succeeded in replacing the acting Prime Minister with his associate. Multiple coups followed in a period of political instability, peaking in 1941.
During the World War II, the Iraqi government of the Prince-Regent, Abd al-Ilah, was overthrown in 1941 by the Golden Square officers, headed by Rashid Ali. The short-lived pro-Nazi government of Iraq was defeated in May 1941 by the Allied forces in the Anglo-Iraqi War. Iraq was later used as a base for Allied attacks on the Vichy French-held Mandate of Syria and support for the Anglo-Soviet invasion of Iran. At the same time, the Kurdish leader Mustafa Barzani led a rebellion against the central government in Baghdad. After the failure of the uprising, Barzani and his followers fled to the Soviet Union.
In 1945, during the final stages of World War II, Iraq joined the United Nations and became a founding member of the Arab League. In 1948, massive violent protests, known as the Al-Wathbah uprising, broke out across Baghdad as a popular demand against the government treaty with the British, and with support from the communists. More protests continued in the spring, but were interrupted in May, when martial law was imposed after Iraq entered the 1948 Arab–Israeli War with other members of the Arab League.
In February 1958, King Hussein of Jordan and Prince Abd al-Ilah proposed a union of Hashemite monarchies to counter the recently formed Egyptian–Syrian union. The resulting Arab Federation, formed on 14 February 1958, was short-lived and ended the same year with a military coup led by Abdul-Karim Qasim deposing the monarchy.
Kingdom of Iraq under de facto British administration
The territory of Iraq was under Ottoman dominance until the end of the First World War, becoming an occupied territory under the British military from 1918. In order to transform the region to civil rule, Mandatory Mesopotamia was proposed as a League of Nations Class A mandate under Article 22 and entrusted to the United Kingdom of Great Britain and Ireland, when the former territories of that Ottoman Empire were divided in August 1920 by the Treaty of Sèvres. However, the 1920 Iraqi revolt resulted in the scrapping of the original mandate plan. Instead, the Kingdom of Iraq was recognised as a sovereign country under King Faisal I of Iraq. Not withstanding the formal sovereignty of the Iraqi king, a treaty of alliance was concluded between the Kingdom of Iraq and the United Kingdom in 1922 called the Anglo-Iraqi Treaty. It provided the United Kingdom with a role in the administration and governance of Iraq. King Faisal had previously been proclaimed King of Syria by a Syrian National Congress in Damascus in March 1920 but was ejected by the French in July of the same year. The British RAF retained certain military control. In this manner, Iraq remained under de facto British administration until 1932.
Under King Faisal of Iraq, the civil government of postwar Iraq was led by the High Commissioner, Sir Percy Cox, and his deputy, Colonel Arnold Wilson. British reprisals after the murder of a British officer in Najaf failed to restore order. British administration had yet to be established in the mountains of north Iraq. The most striking problem facing the British was the growing anger of the nationalists in the Iraqi kingdom.
With the signing in Baghdad of the Anglo-Iraqi Treaty on 30 June 1930 and the settling of the Mosul Question, Iraqi politics took on a new dynamic. The treaty came into force on 3 October 1932, when the Kingdom of Iraq officially became fully independent as the Hashemite Kingdom of Iraq. The emerging class of Sunni and Shia landowning tribal sheikhs vied for positions of power with wealthy and prestigious urban-based Sunni families and with Ottoman-trained army officers and bureaucrats. Because Iraq's newly established political institutions were the creation of a foreign power, and because the concept of democratic government had no precedent in Iraqi history, the politicians in Baghdad lacked legitimacy and never developed deeply rooted constituencies. Thus, despite a constitution and an elected assembly, Iraqi politics was more a shifting alliance of important personalities and cliques than a democracy in the Western sense. The absence of broadly based political institutions inhibited the early nationalist movement's ability to make deep inroads into Iraq's diverse social structure.
The new Anglo-Iraqi Treaty was signed in June 1930. It provided for a "close alliance," for "full and frank consultations between the two countries in all matters of foreign policy," and for mutual assistance in case of war. Iraq granted the British the use of air bases near Basra and at Al Habbaniyah and the right to move troops across the country. The treaty, of twenty-five years' duration, was to come into force upon Iraq's admission to the League of Nations. This occurred on October 3, 1932.
In 1932, the Hashemite Kingdom of Iraq was granted full independence under King Faisal I. However, the British retained military bases in the country. Iraq was granted official independence on 3 October 1932 in accordance with an agreement signed by the United Kingdom in June 1930, whereby the United Kingdom would end its effective mandate on the condition that the Iraqi government would allow British advisers to take part in government affairs, allow British military bases to remain, and a requirement that Iraq assist the United Kingdom in wartime. Strong political tensions existed between Iraq and the United Kingdom even upon gaining independence. After gaining nominal independence in 1932, the Iraqi government immediately declared that Kuwait was rightfully a territory of Iraq. Kuwait had loosely been under the authority of the Ottoman vilâyet of Basra for centuries until the British had formally severed it from the Ottoman influence after the First World War. It was on this basis the Iraqi government stated that Kuwait was a British imperialist invention.
Political instability and army coups, 1933–1941
After Faisal died in September 1933, King Ghazi reigned as a figurehead from 1933 to 1939, when he was killed in a motor accident. Pressure from Arab nationalists and Iraqi nationalists demanded that the British leave Iraq, but their demands were ignored by the United Kingdom.
Upon achieving official independence in October 1932, political tensions arose over the continued British presence in the new Hashemite Kingdom of Iraq, with Iraq's government and politicians split between those considered pro-British politicians, such as Nuri as-Said, who did not oppose a continued British presence, and anti-British politicians, such as Rashid Ali al-Gaylani, who demanded that remaining British influence in the country be removed.
Various ethnic and religious factions tried to gain political accomplishments during this period, often resulting in violent revolts and a brutal suppression by the Iraqi military, led by Bakr Sidqi. In 1933, thousands of Assyrians were killed in the Simele massacre, in 1935–1936 a series of Shi'a uprisings were brutally suppressed in mid-Euphrates region of Iraq, and in parallel an anti-conscription Kurdish uprising in the north and a Yazidi revolt in Jabal Sinjar were crushed in 1935. Throughout the period political instability led to an exchange of numerous governments. Bakr Sidqi himself ascended to power in 1936, following a successful coup d'état against prime minister Yasin al-Hashimi but was later assassinated in 1937 during a visit to Mosul, followed by the death of King Ghazi in a car crash in 1939 suspected to have been planned by the British, causing a regency under Prince 'Abd al-Ilah over the 4 year old king Faisal II of Iraq lasting until 1953.