Where in it did it say slavery couldn't be outlawed?????? If your going to talk about confederates talk abut the real reason they committed treason.
You have no idea what the constituion was for. It was written to define and limit federal authority. The 9th and 10th amendments plainly state that there are no implied powers, if it is not a specifically granted power, the feds don't have it.
Since you jumped in, how about you answer the question, or are you like everyone else I've asked specific questions to, too big a coward to really look at how the government has violated the constitution?