A. Lincoln - Civil War

During his presidency (and even before) , Lincoln believed in a Federal Government of the United States which would be a central government for all the states. In other words a United States of America as the fathers of the country envisioned.

I know this is open to debate as to whether it should be state's rights or a central goverment that ruled the states. But one only has to look to the Declaration of Independence to see that a United States was meant to be (as a new country).

Therefore Lincoln was correct in trying to keep the Union together. (The horrific problem was it was the bloodiest battle in history - to that date).