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.
Suffrage, i had this class last year.
C
Vice President is the only member in the executive branch that can vote in the Senate to break a tie
It was invented in 1950. They started to work on it in 1930 I beleive.
they explain a the fall of the roman empire