I believe they were extending the revolution through the medium of anti slavery, the strongest Union principle.
A Historian would look for a primary source (option d. ) - the definition of a primary source is that it was written at the time of the event, and not later (this is the secondary choice).
The reason that federal courts do not try these cases is because there are already special courts just for these types of cases.
The Cuban Missile Crisis was one of the most tense parts of the Cold War and was going to lead to world nuclear war of conflicts got any tender because there were very dangerous weapons facing the Us only a short distance away in Cuba.
