Because the United States struggled to Unite and quell the rebellion, the answer is B. The United States realized it needed to be more centralized in order to deal with internal and external threats.
Answer: a) The Arctic Ocean borders Russia only to the north.
Answer:
The Second Industrial Revolution, also known as the Technological Revolution, was a phase of rapid standardization and industrialization from the late 19th century into the early 20th century. ... In the same time period, new technological systems were introduced, most significantly electrical power and telephones.