All the wars in his old country
Federalism is a system of government in which the same territory is controlled by two levels of government.
Generally, an overarching national government is responsible for broader governance of larger territorial areas, while the smaller subdivisions, states, and cities govern the issues of local concern.
World war 1 put Russia in debt and the people of Russia didn't think that they should even be in this war. so they started a revolution which eventually put an end to the Russian monarchy.
Many see the harsh terms imposed on Germany after the Treaty of Versailles as creating economic and social conditions that allowed for the fascism and scapegoating of the Nazi Party to get a foothold in Germany.