What was the cause of the duar war

What did president johnson risk violating the tenure of office act to the fire of his secretary of war

When president johnson vetoed a law that would extend the freedmen’s bureau, congress reacted by supporting the veto and closing the freedmen’s bureau. writing a new law to show support for the black codes. overriding the veto and expanding the agency’s powers. drafting a law to prevent african americans from voting.

Was the civil war inevitable? could anything have been done through compromise to stop it, or did it have to happen?