“They didn’t see it as a big problem when they voted in favor of it.”
Apparently, they didn’t see it as a big problem during the 43 years between its passage and secession either. They controlled Congress during that time and could have made changes if they wanted to.
Are you saying that Southerners were stupid, or just lazy?
It is the nature of problems to grow worse over time if they are not dealt with. They finally came upon a solution that worked for them. They would leave.
They controlled Congress during that time and could have made changes if they wanted to.
I do not know that that is true at all. Not all Democrats were in the South, and the New York Democrats certainly wanted the system to remain as it was.
Are you saying that Southerners were stupid, or just lazy?
Here you have provided us with an example of "Fallacy of false choice." The answer is choice number 3, which you did not list as a possibility. They were not able to do so.