日米 にちべい安全 あんぜん保障 ほしょう条約 じょうやくでした
ni chi bēanzenhoshōjōyakudeshita

Noun
Desu Copula

The polite past form of 日米安全保障条約

1. Was the Japan-U.S. Security Treaty.

Past/Perfective
Polite