The Anglo-Persian Agreement involved Great Britain and Persia, and centered on the drilling rights of the Anglo-Persian Oil Company. The "agreement" was issued by British Foreign Secretary, Lord Curzon, to the Persian government in August 1919. It was never ratified by the Majlis (Iranian parliament).
After the 1917 Bolshevik Revolution, the new Soviet government abandoned the former Russian sphere of influence in the five northern provinces of Iran, branding the concept as "Tsarist Imperialism". Britain was the remaining power in the region and Curzon hoped to make Iran not a protectorate but a client state of Britain and of no other great power.
The document gave a guarantee of British access to all Iranian oil fields. In return the British would:
The document was criticized by foreign observers as hegemonic, especially in the United States, which also had designs on accessing Iranian oil fields. Eventually, the Anglo-Persian Agreement was formally denounced by the Majlis on 22 June 1921.