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| 1924 |
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| Suppression of Arab tribal rebellion in Khuzistan. The government gradually brought other tribes in southern Iran (principally the Bakhtiyaris and Qashqais) under its direct control by 1930. Hereafter tribes declined as a social and political factor in Iranian life. Whereas they had made up approximately 20 percent of the population immediately after World War I, they counted for no more than 10 percent by 1941. | 1 |
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| 1925 |
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| Passage of law requiring all Iranians to adopt family names. Prime Minister Riza Khan led the way by choosing the name Pahlavi for himself. By law, individuals also had to obtain birth certificates. | 2 |
| Official standardization of weights and measures. | 3 |
| Adoption of the pre-Islamic Iranian calendar to replace the Islamic system of dating. | 4 |
| The first commercial code. A revised version appeared in 1932. | 5 |
| Installation of street lights in Tehran. By 1929, homeowners in the city had access to municipal electricity. | 6 |
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| June 6 |
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| Military conscription for males at age 21. | 7 |
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| Oct. 31 |
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| TERMINATION OF THE QAJAR DYNASTY. At the behest of Riza Khan the Majlis (parliament) deposed Ahmad Shah, who was away in Europe. | 8 |
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