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What was the political organization of Russia at the time of the Mongol invasion in the first half of the 13th century?A) Russia was united under the rule of the prince of Novgorod.B) Russia was united under the rule of the prince of Muscovy.C) Russia was ruled by Romanov tsars based in Moscow.D) Russia was united under the rule of Kiev.E) Russia was divided into numerous petty kingdoms centered on trading cities.

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