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No Assyrians are quite distinct. North Iraqi Arabs are diverse because they can be Arabized Kurds, Arabized Turkmens, and Arabized Assyrians, and of course Bedouin tribal groups. For example many Bedouins in northern Iraq, migrated once the main clans of their tribes adopted Shiaism. Well Southern Iraqi Arab shias are mostly of Bedouin stock, but have converted to Shiaism quite recently once they settled. Also there was significant Persian/Iranian migration to Najaf and Karbala where these people were Arabized but have known their origin. They were called Tabyiah.
Iraq due to the Mongol invasion was depopulated. According to the chronicles, those who survived the Mongol destruction, left to Egypt and India. Also Iraq was not Desert originally, but the Mongol invasion made it into a desert and later Bedouin Arab tribes migrated into the 15th century and this when Iraq became repopulated. However it also became geopolitical struggle between the Sunni Ottomans and the Shia Safavids.
The Muslim population was totally massacred, and only the Christian population was spared, simply because the wife of Hulgu Khan was a Christian herself. However this rampage of carnage would be stopped by the Mamlukes, both Baibars and Qutuz had deep grudge against the Mongols. Qutuz was described as swarthy and looked like the modern people of Iran, well Baibars was blond and blue eyed. They were slaves to the Mongols, who sold them to the Ayyubids in Egypt. It was this grudge that eventually made them able to crush the Mongols, after this defeat Hulgu was humiliated and it gave him pain, and according to the chronicles he passed away in Iran, either by suicide or deep depression.
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