Answer:
D. The people involved in the slave trade have no right to call themselves Christians.
I’m not sure when you say U.S. but the Republicans supported the idea of state rights. (If you could clarify you question I could help more).
The cartoonist suggest that building the canal was death coming towards Panama's way
1st answer is (a) keeping personal files on prominent politicians
2nd answer is (c) Alger Hiss