春秋 しゅんじゅう戦国 せんごく時代 じだいであれば
shunjūsengokujidaideareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 春秋戦国時代

1. If/When the Spring and Autumn and Warring States period…; Were the Spring and Autumn and Warring States period…

Ba Conditional