Why did the southerners believe they had the right to leave the union?

They did not believe the Federal Government had the right to interfere with their commerce.

Explanation:

Living in a southern state, one of the few things we focused on in history was this :D

glass wants to live in a world of super heroes and villains. he have lived all his life trying to be responsible for the creating the origin story of a super hero; he schemed and caused many incidents (many of them fatal) hoping that someday someone with superpowers would show up and save the day.

he knew himself very much. he saw himself as a villain of a real-life super hero story. he was aware of his strengths (more than smart enough for being manipulative and scheming) and weaknesses (having fragile bones and having to rely on his mind to succeed).