日清 にっしん通商 つうしょう航海 こうかい条約 じょうやくでした
nisshintsūshōkōkaijōyakudeshita

Noun
Desu Copula

The polite past form of 日清通商航海条約

1. Nikko-China Trade and Navigation Treaty was. ; ; (More naturally: The Nikko-China Trade and Navigation Treaty existed/was in effect.)

Past/Perfective
Polite