Under the constitutions of the states and the United States, it requires as explicit and plenary _constitutional_ authority, to make slaves of the children of slaves, as it would to make slaves of any body else. Is there, in any of the constitutions of this country, any general authority given to the governments, to make slaves of whom they please? No one will pretend it. Is there, then, any particular authority for making slaves of the children of those, who have previously been held in slavery? If there be, let the advocates of slavery point it out. If there be no such authority, all their statutes declaring that the children of slaves shall follow the condition of their mothers, are void; and those children are free by force of the law of nature. This law of nature, that all men are born free, was recognized by this country in the Declaration of Independence.--But it was no new principle then. Justinian says, "Captivity and servitude are both contrary to the law of nature; for by that law all men are born free." But the principle was not new with Justinian; it exists in the nature of man, and is as old as man--and the race of man generally has acknowledged it. The exceptions have been special; the rule general. The constitution of the United States recognizes the principle that all men are born free; for it recognizes the principle that natural birth in the country gives citizenship[31]--which of course implies freedom. And no exception is made to the rule. Of course all born in the country since the adoption of the constitution of the United States, have been born free, whether there were, or were not any legal slaves in the country before that time. Even the provisions, in the several state constitutions, that the legislatures shall not _emancipate_ slaves, would, if allowed their full effect, unrestrained by the constitution of the United States, hold in slavery only those who were then slaves; it would do nothing towards enslaving their children, and would give the legislatures no authority to enslave them. It is clear, therefore, that, on this principle alone, slavery would now be extinct in this country, unless there should be an exception of a few aged persons. [Footnote 31: Art. 2, Sec. 1, Clause 5, "No person, except a _natural born_ citizen,* * * * shall be eligible to the office of President."]