afghanistan–iran relations were established in 1935 during king zahir shah's reign and the reza shah pahlavi of iran (persia), though ties between the two countries has existed for millennia. as a result, dari (an eastern dialect of persian) is one of the official languages of afghanistan and many in afghanistan also celebrate nowruz, the persian new year. they have been negatively affected by the 1979 iranian revolution and issues related to the 1978–present afghan conflicts (i.e. mujahideen, afghan refugees, and taliban), as well as iran's water dispute and the growing influence of the united states in afghanistan. on july 2019 iranian government passed a law that provides afghan nationals with a new chance to get iran's residency. afghans with specific scientific and professional achievements and those who have iranian spouses and children are among the people qualified to benefit from this law.