I would say the answer is B. Conflict led to its split into two separate kingdoms. Sorry if I am wrong, but otherwise I hope I was helpful for you.
The beginning of the Lutheran Church :)
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
It was the "(D) Battle of Shiloh" that was a clear Union victory, although it should be noted that some people who actually took part in the battle did not know it was a true victory until later.