Reply #24: Ethnically Arab

[Alcibiades]

Here's the breakdown on the ethnicities of the countries in question:

Iran
Persian 51%, Azerbaijani 24%, Gilaki and Mazandarani 8%, Kurd 7%, Arab 3%, Lur 2%, Baloch 2%, Turkmen 2%, other 1%

Right about Iran. They are mainly Persians, though, as you can see, it's a bare majority.

Afghanistan
Pashtun 42%, Tajik 27%, Hazara 9%, Uzbek 9%, minor ethnic groups (Chahar Aimaks, Turkmen, Baloch, and others)

Right, in a a way, about the Afghans, in that the Pashtuns are an ethno-linguistic group related to the Persians.

Iraq
Arab 75%–80%, Kurdish 15%–20%, Turkoman, Assyrian, or other 5%

Wrong about Iraq, which is mainly ethnically Arab. Both the Shiite and Sunni religious groups are ethnically Arab. Although it's true that (except for the Greek period following Alexander's invasion) Iraq was ruled by Persians, the Arabs swept through during their era of rapid expansion following the death of Mohammad. They stayed on until the present day.