Slavery, if it can be legalized at all, can be legalized only by positive legislation. Natural law gives it no aid. Custom imparts to it no legal sanction.
All, or nearly all, the advantage there is in fixing any constitutional limits to the power of a government, is simply to give notice to the government of the point at which it will meet with resistance.
The number who actually consented to the Constitution of the United States, at the first, was very small. Considered as the act of the whole people, the adoption of the Constitution was the merest farce and imposture, binding upon nobody.
All governments, the worst on earth, and the most tyrannical on earth, are free governments to that portion of the people who voluntarily support them.
The right and the physical power of the people to resist injustice, are really the only securities that any people ever can have for their liberties. Practically no government knows any limit to its power but the endurance of the people.
If taxation without consent is robbery, the United States government has never had, has not now, and is never likely to have, a single honest dollar in its treasury. If taxation without consent is not robbery, then any band of robbers have only to declare themselves a government, and all their robberies are legalized.