The American revolution and the American civil war inspired two different ideas what are they?

The American revolution inspired the idea that a country should secede and gain independence if they believe that the ruler of the country is a malevolent tyrant. The Civil War inspired hte idea that the country needs to remain unified even if the people don't agree and that we can always find a way to keep it together. They are opposite and at the time when they were created they suited the needs of the people.