I answered this one before from another user and I think it’s B
This site should help.
http://regentsprep.org/regents/core/questions/questions.cfm?Course=ushg&TopicCode=3c
Answer:
A period of violence during the French Revolution incited by conflict between two rival political factions, the Girondins and the Jacobins, and marked by mass executions of “the enemies of the revolution.” The death toll ranged in the tens of thousands, with 16,594 executed by guillotine
Explanation:
Hope this helps
Answer:
The provisions of the Missouri Compromise forbidding slavery in the former Louisiana Territory north of the parallel 36°30′ north were effectively repealed by Stephen A. Douglas's Kansas–Nebraska Act of 1854.
One incident would definitely be during the cold war more specifically during The Bay Of Pigs
another would be during a false alarm in which we thought Russia had fired nuclear weapons at us and refrained from firing back before being sure