Discuss the achievements of Japan’s Heian and Kamakura periods

Discuss the achievements of Japan's Heian and Kamakura periods

My question or rather discussion as it pertains to history is: Discuss the achievements of Japan's Heian and Kamakura periods. Look at political, military,economic and cultural spheres. Which period, in your opinion, was more significant to the future of Japan–and why (provide evidence). If possible provide footnotes and bibliography. I need at least two scholarly resources.
 

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