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.
Believed he had power over both churches
It held the quality of the law.it denied special privileges to the noble and the clergy and a bunch of other stuff. Try researching it.
Perhaps the greatest societal change that took place between these two periods was WWII--meaning that after the war in the 50s, America was more likely to ask itself the tough questions regarding race and the role of women, since blacks and women had worked so hard to help the US during the war.