日米 にちべい修好 しゅうこう通商 つうしょう条約 じょうやくでしょう
ni chibe ishū kō tsūshōjōyakudeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 日米修好通商条約

1. Probably the Treaty of Amity and Commerce between Japan and the US.

Polite
Presumptive
Conjecture