You know who did NOT support states' rights? Hitler!
Since for us the state as such is only a form, but the essential is its content, the nation, the people, it is clear that everything else must be subordinated to its sovereign interests. In particular we cannot grant to any individual state within the nation and the state representing it state sovereignty and sovereignty in point of political power ... [the] mischief of individual federated states…must cease and will some day cease…. National Socialism as a matter of principle must lay claim to the right to force its principles on the whole German nation without consideration of previous federated state boundaries."
- Adolf Hitler