帝国 ていこく主義 しゅぎ しゃではありませんでした
teikokushugishadewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 帝国主義者

1. Was not an imperialist.; Was not a proponent of imperialism.

Past/Perfective
Negative
Polite
Formal Register