It is very much hard to answer.
It was mainly because of how the North and the South of America had different lifestyles and economy's. You would be surprised to know that the Democratic party back then supported Slavery and the republicans dint support Slavery.
Plain Answer: Because of Slavery, Way of Life and Different Economy. The Democratic Party would do anything to keep themselves supported.
The answer would be B the magna carta
The government in the United States today is different from government in ancient Athen, in a way that the United States is a republic.
The responsibilities that were assigned to the federal government under the Articles of Confederation is drawing up treaties.