Why did the external danger increase during the fragmentation period?

Because the state has ceased to be united and, accordingly, the chances of repelling an external invasion have decreased. Thus, in the middle of the 13th century, it underwent the Mongol-Tatar invasion, but it could not provide organized resistance, one after another the principalities fell under the onslaught of the horde. So in 1240 most of the Russian lands fell under the rule of the invader.



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