The Satchodo (Satsuma, Choshu and Tosa Domains) formed a partnership through exchanges held among nationalist patriots from these three domains in the late Edo period, as well as through the Satsuma-Choshu Alliance and the Satsuma-Tosa Alliance.
薩長土は、幕末、志士たちの交流や薩長同盟・薩土同盟で連携関係を結んでいた。