だい日本にっぽん帝国ていこく憲法けんぽうだったら
dainipponteikokukempōdattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 大日本帝国憲法

1. If it were the Greater Japan Imperial Constitution; Had it been the Greater Japan Imperial Constitution

Tara Conditional