According to the information in the hadiths, Hazrat Mahdi (as) will work among the Turkish nation.
"HAZRAT MAHDI (AS) WILL NEVER LEAVE RUM, THE TURKS [because Turkey used to be known as region of Rum.]” (Narrated from Ish'afu'r-Ragibin by Tilsimlar, Bediuzzaman Said Nursi, p. 212)