You've seen this before.
"And this issue embraces more than the fact of these United States. It presents to the whole family of man, the question, whether a constitutional republic, or a democracy--a government of the people, by the same people--can or cannot, maintain its territorial integtrity against its own domestic foes. It presents the question, whether discontented individuals, too few in numbers to control administration, accroding to organic law, in any case, can always, upon the pretenses made in this case, or on any other pretenses, or arbitrarily, without any pretense, break up their government, and thus practically put an end to free government upon the earth. It forces us to ask: "Is there in all republics, this inherent, and fatal weakness?" "Must a government, of neccessity, be too strong for the liberties of its own people, or too weak to maintain its own existance?"
A. Lincoln, 7/4/61
That is why the slave holders had to be opposed.
Walt
But to answer your 192, please read post 186. Especially if you'd like to see what the Supreme Court thinks about the 10th Amendment.