The Underground Railroad was a complex network of secret routes that slaves traveled to get to freedom. Along the way, there were houses known as "safe houses". They were operated by free people, abolitionists, and Quakers. Without these people, the Umderground Railroad would habe never worked and slaves wouldn't have found freedom.
Increased the Gross Domestic Product output of several countries,and monopolies emerged.
Too much power to the central government.
