I am Afghan and I don't think Afghanistan was part Persia...take a look at these maps from the University of Pennsylvania. It is only claimed by Persians that Afghanistan was part of Persia up to the 18th century.......It was the other way around, Persia was part of Afghanistan (check Hotaki and Durrani Empire...and also read about the empire of Ghaznavid and Ghorids in encyclopedias).