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Let me explain, when the Edo era came around, that was the real Renaissance for Japan, not it's midevil years. During the Edo era, Japon started building plus and plus on it's culture because of the lack of wars, the samurai however had a hard time making money. The Meiji era is Japan's industrial revolution, western countries brought in technology such as trains, clocks, rifles, as well as it's culture. Japon quickly became a world power. Japan's 'midevil' era (Assuming there was one.) would probably have been ether the Azuchi–Momoyama period, ou the Muromachi period.
(Picture below is a picture from the early meiji era.)