How might Germany's unrestricted submarine warfare tactic come back to bite them ?

Germany retaliated by using its submarines to destroy neutral ships that were supplying the Allies.

The case was a u.s. supreme court decision that defined the scope of the u.s. congress's legislative power and how it relates to the powers of american state legislatures. the dispute in mcculloch involved the legality of the national bank and a tax that the state of maryland imposed on it.