砲艦 ほうかん外交 がいこうじゃなかったです
hōkanga ikōjanakattadesu

Noun
Desu Copula

The polite, past negative form of 砲艦外交

1. Wasn't gunboat diplomacy.; Wasn't acting with gunboat diplomacy.

Past/Perfective
Negative
Polite
Casual Register