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Isfahan in OTL was once the capital city of Iran since the Safavids. Only to be relocated to Mashhad and Shiraz during the Afsharid and Zand periods respectively until it was finally settled in Tehran in 1775 by Agha Mohammad Khan the founder of the Qajars. Mainly for political and strategic reasons (also to avoid those who're formerly loyal to the Safavids and the Zands.)
What happens if, as stated above, Isfahan remained as Iran's capital city till modern day?