The Choshu and Satsuma Domains were gaining so much power that they were called Yuhan (the powerful domains), improving financial affairs by carrying out reforms according to the conditions of the countries in Tenpo era.
長州藩と薩摩藩は天保時代に国情に応じた改革を実行することで藩の財政を改善し、幕末には雄藩と言われる程の力を得ていった。