修好 しゅうこう通商 つうしょう航海 こうかい条約 じょうやくだったら
shūkōtsūshōkōkaijōyakudattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 修好通商航海条約

1. If/when the Treaty of Amity, Commerce, and Navigation…; Had it been the Treaty of Amity, Commerce, and Navigation…

Tara Conditional