The Tokugawa period, also known as the Edo period, of Japan collapsed due to unrest in the early 1800s. The government was being poorly managed which deteriorated the social classes. Western intrusion began to open Japan to the influence of the rest of the world. Also, famine and natural disasters caused many issues, especially in the peasant class.
British defeated China in the opium war and how the imperialists had forced China to sign the unequal treaties. Matthew Perry, the problems that Tokugawa Japan forced during the 1800's include foreign pressure, crisis and revolt. Social and economic unrest.
You might be referring to the end of the age of warring states, when Tokugawa Ieyasu 'unified' Japan. This was in the early 17th century.
Japan and China
midwestern farmers
america
Nobunga and Hideyoshi were unable to restore central authority to Japan. However, the Tokugawa rulers are the ones who restored the central authority.
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dry food and crops
The process of Japanese unification was completed by the Tokugawa shogunate in the early 17th century. Tokugawa Ieyasu emerged victorious after a period of civil war, bringing an end to the Warring States period and establishing a long era of peace and stability in Japan.
It went from a great power to an isolationist nation, much like Japan
The main cause for Japan's isolationism was to avert the spread of Christianity. Several Edicts were issued throughout the early years of the Tokugawa Shogunate, declaring isolation, Each edict grew more and more forceful in its condemnation of Christianity. Tokugawa Iemitsu's Closed Country Edict of 1635 began the strict isolationist policies that lasted until the late Nineteenth Century.
reformers turned to public authorities to establish new institutions.