The League of Nations was an international organization created after World War I to preserve the peace. Under the terms of the Covenant (Constitution) of the League of Nations, Great Britain was granted a mandate over Iraq or the former Ottoman vilayets of Mosul, Baghdad, and Basra. Thus, the British became responsible for Mosul or what became Iraqi Kurdistan (northern Iraq).
In 1926, the Council of the League of Nations settled the dispute over Mosul between Turkey and Great Britain and formally recognized the incorporation of Mosul into Iraq. At the same time, the International Commission of Inquiry established by the League Council required that "the desire of the Kurds that the administrators, magistrates and teachers in their country be drawn from their own ranks, and adopt Kurdish as the official language in all their activities, will be taken into account." Although Iraq did issue a Local Languages Law, these pledges to the Iraqi Kurds were not included in the Anglo-Iraqi Treaty of 1930, which granted Iraq its independence in 1932. Upon independence, Iraq promptly joined the League of Nations and, in effect, became one of the first independent third world states.
Historical Dictionary of the Kurds. Michael M. Gunter.