"What is the opposite of "slavery?"

It's not actually "freedom." The Founders weren't fighting for freedom, they fought for Liberty. So what is the difference?

The prohibitions contained in the Constitution allowed for the abolition of all forms of slavery, by prohibiting ex post facto laws, enshrined the writ of habeas corpus and prohibited Titles of Nobility. In all, these things did more to secure and protect liberties than anything that was contained in the State Constitutions under the Confederacy."