4Gold:
Do you mind if I answer your original unnumbered question?
The answer is, no. At least if one follows the constitution.
Article 1, Section 9 of the Constitution of the United States of America, in pertinent part:
"The Migration or Importation of such Persons as any of the States now existing shall think proper to admit, shall not be prohibited by the Congress prior to the Year one thousand eight hundred and eight, but a Tax or duty may be imposed on such Importation, not exceeding ten dollars for each Person."
Migration is one thing, but we only import property and not people. So until 1808, slavery was to be allowed.
But, that being said, the above is rather clear evidence that more than a few responsible for the US Constitution believed that slavery was morally wrong and should be abolished/eliminated and so reserved the right to do so in 20 or so years, and made it entirely plain that the abolition/elimination could be accomplished by Congress via statute, and without the necessity of constitutional amendment [i.e., a mere majority and not a super-majority, and no need for state ratification of the same].
And for further support for that proposition, as I said, we only import property and not persons. But yet the document speaks of Persons being imported. With the message being subtle code that we do recognize them as persons, and it's only because the southern states are more or less entirely based on slavery, and how do we deal with that in one day, that we compromise and allow for the 20 or so years.
As Abraham Lincoln so aptly put the matter in a speech of his at New Haven, and to relate this to the above, note the reference to importation of slave-labor in the first paragraph [
http://www.historyplace.com/lincoln/haven.htm ]:
"Now, gentlemen, the Republicans desire to place this great question of slavery on the very basis on which our fathers placed it, and no other. [Applause.] It is easy to demonstrate that "our Fathers, who framed this government under which we live," looked on Slavery as wrong, and so framed it and everything about it as to square with the idea that it was wrong, so far as the necessities arising from its existence permitted. In forming the Constitution they found the slave trade existing; capital invested in it; fields depending upon it for labor, and the whole system resting upon the importation of slave-labor. They therefore did not prohibit the slave trade at once, but they gave the power to prohibit it after twenty years. Why was this? What other foreign trade did they treat in that way? Would they have done this if they had not thought slavery wrong?
Another thing was done by some of the same men who framed the Constitution, and afterwards adopted as their own act by the first Congress held under that Constitution, of which many of the framers were members; they prohibited the spread of Slavery into Territories. Thus the same men, the framers of the Constitution, cut off the supply and prohibited the spread of Slavery, and both acts show conclusively that they considered that the thing was wrong.
If additional proof is wanting it can be found in the phraseology of the Constitution. When men are framing a supreme law and chart of government, to secure blessings and prosperity to untold generations yet to come, they use language as short and direct and plain as can be found, to express their meaning. In all matters but this of Slavery the framers of the Constitution used the very clearest, shortest, and most direct language. But the Constitution alludes to Slavery three times without mentioning it once! The language used becomes ambiguous, roundabout, and mystical. They speak of the "immigration of persons," and mean the importation of slaves, but do not say so. In establishing a basis of representation they say "all other persons," when they mean to say slaves -- why did they not use the shortest phrase? In providing for the return of fugitives they say "persons held to service or labor." If they had said slaves it would have been plainer, and less liable to misconstruction. Why didn't they do it. We cannot doubt that it was done on purpose. Only one reason is possible, and that is supplied us by one of the framers of the Constitution -- and it is not possible for man to conceive of any other -- they expected and desired that the system would come to an end, and meant that when it did, the Constitution should not show that there ever had been a slave in this good free country of ours! [Great applause.]"