Japanese militaristic authorities utilized this theory as background support in many ideological situations; on the occasion of rising the Seikanron (Debate to conquer Korea), merging Korean Empires (the annexation of Korea) practically and when Nikkan Doso Ron (Japan and Korea have a common ancestor) was birthed, then the assimilation policy in foreign lands (for example, imperialization education on Korea during Japan's colonial rule) was implemented and went forward.
征韓論が台頭したとき、そして実際に大韓帝国を併合する際（韓国併合）や、日韓同祖論が生まれて外地における同化政策（皇民化教育など）が進められるようになったときも、その思想的背景の一つとなった。