Very eye opening. Lot of the stuff I knew already. I know Arabs hate Persians for many reasons and it is quite profound. I know Turks hate Arabs. Koreans by the way are related to Turkic people. I would imagine Arabs fear Persians invading them. I know Persians hate being called Arab and take it as derogatory. Persians are more European and Indian, then Semitic. Heck, Farsi and Hindi are almost similar. Iran is quite heterogenous, Persians, Kurds, Turkic, Jews, and Arabs. Afghanistan is quite heterogenous too, Pashtun, Uzbez, and Turkic. There could never be a unified pan-Islamic empire again likely. Too much conflicts in interests. Many take their ethnicity more seriously, then religion.