[1] In the han system, Mito was a political and economic abstraction based on periodic cadastral surveys and projected agricultural yields.
During the Edo period, Mito represented the center of nativism largely as a result of the Mitogaku, an influential school of Japanese thought, which advanced the political philosophy of sonnō jōi ("revere the emperor, expel the barbarians") that had become a popular sentiment after 1854.
The domain's promiximity to the de facto capital in Edo was a contributing factor to this power as well as the fact that many people unofficially considered the Mito daimyō to be "vice-shōgun".
[8] Mitsukuni initiated the creation of the Dai Nihon-shi by the scholars in order to compile a history of Japan which would focus on the imperial line.
Fujita and the other opponents of Tachihara called for the removal of Asaka Tanpaku's "Appraisals" as well as the changing of the name Dai Nihon-shito "Nihon" or "Yamato".
As Mito thought developed during the 19th century, the scholars began to emphasize anti-Western sentiment and the importance of the emperor in Japanese society.
In particular, Mito scholars embraced the political slogan "sonnō jōi" which means "Revere the Emperor and Expel the Barbarians".
[16] In the work, Seishisai also advanced the idea of kokutai ("national essence") which combined Confucian morals, Shinto myths, and other philosophies.
According to Seishisai, the Japanese imperial family were direct descendants of Amaterasu, the Sun Goddess, so Japan was supposed to establish the proper standard for other nations to emulate.
Fujita, a prominent scholar, argued that Japanese civilization would end as a result of internal problems rather than external threats.
Other writers of the late Mito school such as Fujita Toko and Seishisai also agreed that lack of moral leadership would weaken Japan from within and expose the country to the invasion of Westerners.
Basing his argument on Neo-Confucianism, Fujita reasoned that the emperor grants power to the shōgun to confront domestic and foreign dangers.
Fujita and the other Mito scholars decided that the shogunate had not upheld its duty to preserve the defense or economic prosperity of Japan.
[19] Starting in 1830, Nariaki vocally supported the ideas of the Mito school by championing sonnō jōi and demanding that the shogunate honor the emperor by fulfilling its duties.
Drawing on his Confucian beliefs, Nariaki believed that Japan needed a revival of morality in order to combat weakness.
[21] In response, he called for the shogunate to rebuild the military and economy of Japan (leading to Fukoku kyōhei) and for the shōgun to provide guidance.
[22] In 1840, the Opium War began between China and Britain, and Nariaki's predictions about Western interference also appeared to be a legitimate concern.
Western pressure on Japan culminated in 1853, with the arrival of Commodore Matthew Perry and the Black Ships, which presented a significant challenge to Japanese isolationism.
In 1858, Hotta met with Emperor Kōmei and submitted the Harris Treaty, which allowed for Westerners to trade in Japan and granted them extraterritoriality.
To solve the problem, the fudai daimyōs put Ii Naosuke in charge as great councilor (Tairō) of the shogunate.
Tokugawa Nariaki repeatedly criticized the shogunate for their moral decay and inability to protect Japan from financial ruin or foreign invasion.
The Mito school of thought likewise provided a nationalist, pro-royal ideology which influenced many of the leading anti-bakufu revolutionaries.
[26] While the Mito scholars never actually called for the overthrow of the bakufu, their emphasis on internal and external threats to Japan impacted the political views of the revolutionaries.
[8] The Mitogaku played a major role in inspiring the anti-bakufu elements in Japan to unite and lead the Meiji Restoration.
The bakufu and domain military forces joined together in order to crush the uprising, and the loyalist movement temporarily lost momentum.
The Tengu insurrection was an important event because it represented the growing discontent with the bakufu in the years immediately leading up to the Meiji Restoration.