Which was in retaliation for Prussia imposing a 5 billion franc war indemnity and taking Alsace and Lorraine from France at the end of the Franco-Prussian war in 1871. And Prussia justified that because of the indemnity Napoleon imposed on Prussia in 1807. So, it could be said that the roots of WWII go back to Napoleon.
It’s like the “Troubles” between England and Ireland.
Finding a villain is about as defining as finding a Yankee.