They made Channels underground a lined with clay to prevent sepage in the surrounding soil. They were a big contribution and we still do something inspired by that today.
Hitler lived in the Führer Headquarters, of which there were 14. He spent more time at the Berghof, in Obersalzberg, than he did at any other place during World War II. However, he spent his final days at the Führerbunker in Berlin, where he killed himself.
The Constitution is the answer
The answer is B
the both plans wanted the southerners to take a loyalty oath to the union