だい日本 にっぽん ゆたか秋津洲 あきつしまであれば
dainippon yutaka akitsushimadeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 大日本豊秋津洲

1. If/When it were Great Japan, abundant in autumn harvests…; If Great Japan were abundant in autumn harvests…

Ba Conditional