Passage: The Firqah-i Dimukrat, or Azerbaijani Democratic Party (ADP), publicly announced its formation in Tabriz on September 3, 1945 by a group of veteran communists headed by Ja'far Pishevari. After the announcement, the communist, Soviet-supported Tudeh party dissolved its Azerbaijan chapter and ordered its members to join ADP. ADP expanded throughout Iranian Azerbaijan, and initiated a local coup d'état with help from Soviet army, who prevented the Iranian army from intervening. During the first week of September 1945, the Azerbaijani Democratic Party, led by Ja'far Pishevari, a long-time leader of the revolutionary movement in Gilan, declared itself to be in control of Iranian Azerbaijan, promised liberal democratic reforms, and disbanded the local branch of Tudeh. Later in September 1945, at its first congress, the Azerbaijani Democratic Party authorized the formation of a peasant's militia. This militia started a bloodless coup on November 18, 1945 and by November 21, 1945 they had captured all remaining government posts in the province, and Iranian Azerbaijan "became an autonomous republic under the direction of a 39-member national executive committee".  The reality of the power seems to have been exercised by Mohammed Biriya, the Minister of Propaganda and head of the local secret police.At the same time, the US was steadily increasing its military assistance to the Iranian government. Under pressure by the Western powers, the Soviet Union revoked its support of the newly created state and the Iranian military succeeded in re-establishing Iranian rule in November 1946. According to Tadeusz Swietochowski:

Question: When was Iranian rule re-established?
November 1946