The Roman soldiers were more text book, while the germans were willing to try different things. Good luck!
Signing treaties would be an executive power which is authorized by the Constitution
I believe the answer is: Jones vs. Mayer
The case Jones vs. Mayer revolved around the the situation when the sellers of the house put a higher requirement for potential buyers from members of racial minorities. The case ended up in the creation of 42 U.S.C. § 1982 which banned all form of discrimination in protperty selling.
