Megatrends was a very popular book form the 1980's that attempted to make predictions about the future.
Many people considered this as a, "mainstream book."
The answer for your question is c
The system of escape routes and hiding places for runaway slaves was known as Underground Railroads.
In the US, slavery led to the creation of such escape routes and safe houses in order to help slaves escape and lead a normal life after that. They would either run to Canada or free states within America which abolished slavery. One of the most famous leaders was Harriet Tubman.
<span>he wanted to find a new way to circumnavigate the world </span>
It was "nationalism" that replaced the feelings of sectionalism in the early 1800s, since this was a time of great physical and emotional growth for the US, in which the country started to feel more like a single "unit".
