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.
Answer:Yes
Explanation: Because a number of factors, including the 1994 economic crisis in Mexico, caused the PRI to lose its absolute majority in both chambers of the federal congress for the first time in 1997. After several decades in power the PRI had become a symbol of corruption and electoral fraud.
The answer is B. It was based off the moral principles.