Any historical "start point" to the current state of affairs is arguable. The current government of Iran was promulgated in 1979 following the White Revolution. That could be used as a start point. As could the first change in power under that constitution following the death of Khomeini. Or, quite validly, the 1953 coup pushed by the USA and UK that returned autocratic power to the anti-communist shah displacing the elected prime minister as head of government. Again, one could start the story in 1941 with the Soviet occupation of Tehran to support the removal of the father of the 1953 coup's power recipient -- who had himself seized power in 1921. Or you could date if from the period of Ottoman rule, or the impact of the Mongol invasion, or -- yes -- the dispute over the succession to the Prophet Mohammed. Heck, you could even make a case for the lasting impact of Megos Alexandros' absorption of the Persian empire by the classical "West" following Gaugamela in the 4th century BCE.
As there are enough of those still alive from the 1953 event to tell the story, and the first generation of those raised as children by those impacted by 1953 are often the ones in power at present, it is a pretty reasonable start point to explain the thinking underpinning the current set of events.
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