@_niten @AllanRicharz @AmbroiseVelvet You're both correct. Japan signed treaties (known collectively as 安政五カ国条約) with those five powers, ending her seclusion, but four (英米仏蘭) renegotiated theirs after waging 下関戦争 together and the revised agreement (改税約書) was signed in 1866:
https://t.co/a68pOULYSq