Japan's decentralized government allowed radical nationalists to impose their plans on the nation due to a combination of factors. Firstly, the weakened central government had limited control over local factions and the military, providing a fertile ground for radical nationalist groups to gain influence. Secondly, these groups exploited the existing social and economic unrest in the country following World War I and the Great Depression, presenting themselves as a solution to restore Japan's pride and economic stability. Finally, the lack of a strong opposition or effective checks and balances enabled these radical nationalists to manipulate politics and successfully push forward their expansionist agenda.
