When Bakufu executed trade agreements with various countries and opened the country to foreign trade and diplomatic relations, activists outside of government, who were under the influence of Mito-gaku, built up the argument of tobaku against Bakufu, which, for reasons that were superficial, did not carry out the expulsion of foreigners.
幕府が諸外国と通商条約を締結して開国を行うと、在野の志士(活動家)たちは、水戸学の思想的影響のもと、名分論に基づき攘夷を断行しない幕府に対する倒幕論が形成された。