Is Concrean History Bifurcated?

Is concrean history bifurcated between colonial and pre-colonial histories, including japan? Or is this a constant thing throughout history, kind of repeated at different turms? Osis: I do think that corea does have a very bloody history. There has been a lot of conflict, a lot of foreign invasion. Am that it's important to understand each of those things like, in their own era, under their own conditions?"