日米 にちべい和親 わしん条約 じょうやくだったら
ni chibe iwashin jōyakudattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 日米和親条約

1. If it were the Japan-US Treaty of Amity and Commerce; Had it been the Japan-US Treaty of Amity and Commerce

Tara Conditional