Yes, Second Reich. Adolf did not lack precedent for his “Third” iteration. The railroads were called “Reichsbahn” and the central bank “Reichsbank”; the national symbol was the “Reichsadler” (the eagle motif) and the legislature was the Reichstag.
The sinking of the Lusitania was a big violation of neutrality. Wilson had sent several notes to the Kaiser requesting that the U-boats not sink ships with US citizens on board, which were utterly ignored.
That's like asking not to bomb a hospital where armaments are stored.
Idiotic. No historian anywhere uses the term second reich. And as for neutrality, a US citizen on a ship doesn’t make it neutral.
Neither does its British flag. Neither does its military munitions cargo.
A ship loses neutrality in those situations. The Lusitania was not a violation of neutrality. (but selling weapons to the Brits was)