ANSWER:
to manipulate the price of an item in the marketplace by manipulating the level of supply, demand or both
The correct answer is <span>B) Germany's resumption of unrestricted submarine warfare
Unrestricted submarine warfare meant that they would no longer care whether a ship was a merchant one, a civilian one, a military one, or whatever other kind exists. This is why many United States ships were sunk even though US were not even in the war. After the introduction of this policy, the United States entered the war officially.</span>
Answer:
The northern states wanted slaves for the new factories.