The aspect of fiction that realist writers use to advance the plot of their story would be : The complexity of the characters.
Realist writers tend to advanced the plot by somehow explaining the motives that influence each characters, creating a tension and plot based on our human understanding and empathy
Most likely the spainish. They took a lot of slaves from the Caribbean, before after or during the salve trade with europe
A. The vice president automatically assumes the presidency.
Although it would only be until the President has recovered, the Vice President would become the Acting President as long as the President was unable to fulfill his duties.
John Quincy Adams is the answer