Tajik People of Afghanistan ( Iranian People)

It is said That the URHEIMAT of not Only Iranians but Also the Indo-Iranians "ARYANS" in general was the approximate region of Bactra(Balkh), Margiana(Marw) and Haraiva(Herat). And That it was called Airyanem Vaejah.
Iranian people Have lived in this region for at least a 7000 years. This region is today Located mainly in Northern and western Afghanistan and Iranian People of this region are generally designated as Tajik.
Alternative names for the Tajiks are Fārsī (Persian), Fārsīwān (Persian-speaker), and Dīhgān (minor land-owners).
Although The Ansectors of Tajik are believed to have been ethnic Persians and Parthians along with East-Iranian Bactrians, Sogdians, Haravatians
but for sure the Northern Iranian Tribes of Saka and The Tokharian Kushans have had a great impact on the formation of Tajik identity.
Many Great Iranian Empires have had their core in this region. Achaemenid, Arsacid, Sassanid, Bactrian, Kushan and the Indo-Saka Empire are just a few to be mentioned.
the oldest known usage of the word Tajik as reference to Persians in Persian literature can be found in the writings of the Persian poet Jalal ad-Din Rumi.
The language of the Tajiks is an eastern dialect of Persian called Dari or also Parsi-e Darbari.
Various scholars have recorded the Zoroastrian, Buddhist, and Aryan pre-Islamic heritage of the Tajik people.
Today however, the great majority of Tajiks follow Sunni Islam, although small Twelver and Ismaili Shia minorities also exist in scattered pockets.
Many great Poets and Scientists of Persian Language and Culture have risen from this region. Zoroaster, Avecinna, Biruni, Khwarizmi, Rumi, Rudaki are just a few to mention.

http://en.wikipedia.org/wiki/Airyanem_Vaejah

http://en.wikipedia.org/wiki/Iranian_peoples

http://en.wikipedia.org/wiki/Greater_Iran

http://en.wikipedia.org/wiki/Tajik_people