Kammala wannan jumla: A ranar 17 ga Oktoba, 1856 Hotta ya kafa kuma ya jagoranci kwamitin "ad hoc" na jami'ai da ke da masaniya ta musamman game da harkokin waje. A watan Nuwambar 1856, ya tuhumi membobin da su zo da shawarwari game da sharuddan bude tashar jiragen ruwa na Japan. Sakamakon tattaunawarsu zai zama tushen tattaunawa wanda a ƙarshe ya haifar da Yarjejeniyar Amity da Kasuwanci na 1858 (wanda aka fi sani da Yarjejeniyar Harris), wanda ya buɗe tashar jiragen ruwa shida zuwa kasuwancin Amurka, kuma ya kafa ikon mallakar ƙasashen waje. Bisa ga saninsa game da abubuwan da suka faru na
Yaƙin Arrow, Hotta ya yi imanin cewa za a sami mummunar amsa daga Amurka idan aka ƙi buƙatun baƙon Amurka Townsend Harris. Duk da haka, ya zama dole a shawo kan Sarkin sarakuna Kōmei ya yarda da yarjejeniyar. Tafiya zuwa Kyoto, Hotta ya sami Sarkin sarakuna cikin aminci a tsakiyar ƙungiyar "jōi" a cikin Kotun Imperial, waɗanda suka fi son korar baƙi daga Japan, da ƙarfi idan ya cancanta, kuma an tilasta masa komawa Edo hannu wofi. A saman wannan, "shōgun" Tokugawa Iesada ya yi rashin lafiya sosai kuma rikici ya ɓarke a cikin kotun Shogunal game da wanda zai gaje shi. Tare da waɗannan batutuwan har yanzu ba a warware su ba, an maye gurbin Hotta da Ii Naosuke a ranar 21 ga Yuni, 1858, wanda aka ba shi taken "tairō".