@ Birth of Kazakhs from seduction of Kipchak women by Mongols or what is hidden from you by the official Astana?
Modern genetic studies have shown that paternal Y-DNA Haplogroup C3 prevail in the Kazakhs, which is mainly found among the Mongols and the Manchus and not found in other Turkic people. In Kirghiz prevails paternal Y-DNA haplogroup R1a1, which shows that the Kirghiz people are of Scythian origin.
But how it comes that Kazakhs speak Kipchak dialect of Turkic language and are considered a sort of fraternal people to Kirghiz?
Again the door opens easily. A number of Kazakh tribes emerged in the era of the Mongol invasion and had Mongolian names. In particular, the medieval history of the Mongols reflects iconic names for the Kazakh psyche, such as Naimans, Konyrats, Uysuns, Zhalairs, Argyns, Kerayits, and very little survived from the pre-Mongol history of Kazakhstan, from which in the modern Kazakh tribal structure survived the names, perhaps, only Kipchaks and Kangly. Direct connection of the Kazakh Uysuns, Dulats with Mongolian Hushins and Duklats are confirmed by historical data. Invading to the Kipchak steppe, the Mongol warriors held harems of turkic women, and became the founding fathers of new genera and tribes, passing to offsprings the names of their own tribal affiliation. Offsprings of the Mongolian invaders started speaking in Turkic languages and local dialects. Maybe that's why the Kazakh's native language is called "ana tili" ("mother tongue").
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Chinese traveler Xu Ting in 1236 writes: "[H, Xu] Ting, watched their [ie, the Tatars Mongol] customs - a husband has a few dozen wives or more than a hundred wives ... Genghis established as a law, it is necessary to them [the Tatars] breed to multiply their offspring "(Yes, I Peng, Xu Ting 1940, p. 23a). Mongolian warlords, who often served military service were probably not able to control the process of educating their kids, their wives and children were of course numerous. And their turkic wives spoke mostly Turkic and not Mongolian, those women sang lullabies to kids in Turkic languages and raised their children from the Mongols in the Turkic-speaking environment, and these processes were irreversible, and gradually turkicized Mongols.
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Invasion of the Mongol tribes caused great trouble to Kipchaks. Plano Carpini, describing his journey through the territory of modern Kazakhstan, found that it is necessary to announce he had seen "numerous head and bones of dead people lying on the ground like manure ...". Carpini thus speaks of the extermination of the Kipchak and Kangly people by Mongols. As you may know, until the Mongol invasion led by Genghis Khan, Kipchaks lived in the steppes of Dasht-i Kipchak in the territory of modern Kazakhstan, so the land used to be called the Kipchak steppes (Kipchaks lived here after the Oghuz, Kipchaks drove them to the west and south). The Mongols of Genghis Khan fought violently with the Kipchaks, as they saw them as a threat to their existence. No wonder the historians say about the Kipchak civilization. Kipchaks were sworn enemies of the Mongols and the Mongols pursued Kipchaks to Hungary and the Czech Republic (know about Kotyan Khan and his Kipchaks) and to the Middle East for the sole purpose of destroying them. If you take the current percentage of Kipchak among the Kazakhs, they are about 10% -15%. The low proportion of Kipchaks, which used to be famous in modern day Kazakh land, and a large proportion of other Kazakh tribes of Mongolian origin clearly indicates that the Kipchaks were indeed destroyed by Mongols. Do not forget that the alien invaders - the Mongols of Genghis Khan took to wife Kipchak local women as trophies, and gradually assimilated to become Turkic speaking. Children born from his Mongol father - and turkic Kipchak mother started speaking the mother tongue, not the language of father. Mongolian tribes of Genghis Khan, settled in the steppes of Kazakhstan played significant role in the ethnogenesis of the Kazakhs.