戊申 ぼしん詔書 しょうしょだったら
boshin shōshodattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 戊申詔書

1. If it were the 1868 edict…; Had it been the 1868 edict…; When it was the 1868 edict…

Tara Conditional