B is the correct answer! :D
To declare boundaries between the thirteen colonies and the Appalachian Mountains, so American colonists couldn’t create tension with the French and Native Americans who live across the mountains.
The insistence of the United States on her trading rights was also important. Soon after the war began Britain, France, and their allies set up a naval blockade of Germany and Austria. Even food was contraband. ... Surely, the Americans argued, international law protected the right of one neutral to trade with another.
It was primarily the Industrial Revolution that caused the nations cities to grow in population at the end of the nineteenth century, since this brought about the creation of a massive amount of factories, all of which required large number of laborers who almost all lived in the cities.
