But you quoted me out of context. My point was that if Southerners had stayed in Congress, they could have limited the increase in the tariff through tactics like the filibuster, if they had really wanted to. But they didn't care as much about the tariff as later mythmakers want to believe they did.
I hate to be persistent but the filibuster is not a constitutional provision. That means it is not in the constitution.
The filibuster is a rule of the Senate. Changing the rules of the Senate does not require a constitutional amendment. Senate rules can be changed relatively easily, especially when the majority wants to “get” the minority.
Your use of the term “if they had really wanted to” provides an insight into your understanding of the nation's prewar dynamics, and contrasts with the understanding of world historians - like Winston Churchill - who called the North/South conflict the “least avoidable war.”