On the contrary, I posted the specifics of the bill debated of the Mississippi legislature that would have deported all free blacks. But if you want more, then for your reading pleasure I submit the following:
"If any slave hereafter emancipated shall remain within this commonwealth more than twelve months after his or her right to freedom shall have accrued, he or she shall forfeit all such right, and may be apprehended and sold by the overseers of the poor of any county or corporation in which he or she shall be found, for the benefit of the poor of such county or corporation." 1806 Virginia Manumission Law [Shepherd, Statutes at Large, III, 252; passed January 25, 1806; in effect May 1, 1806.] The particulars of that law was later added to the Virginia Constitution. This was in addition to the Virginia Migration Law of 1786 which made it illegal for free blacks to move into the state. In 1836 Virginia passed the Literacy Law which made it a crime to teach a black to read, and in 1838 Virginia passed the Virginia School Law which prohibited any black who left the state to go to school from ever returning. So you want to explain again how it was all the Yankees?
An 1838 court case in Alabama, Trotter v Blocker (6 Porter 269), ruled that emancipation was a gift and that slaves lacked the legal capacity to accept the gift of freedom. Therefore, manumission was illegal.
In 1844 South Carolina passed an Amusement Law which prohibited blacks and whites from engaging in sports or games together. That came on top of the Looking Law of 1841 which prohibited blacks and whites from looking out the same window.
Mississippi had a number of laws on the books designed to rid the state of free blacks. It is a matter of fact that these laws were rarely enforced, and most of the blacks deported from the states were, in fact, slaves. Some of these slaves were problem cases but many were elderly slaves who had reached the end of their economic usefulness and were a financial burden on their owners. (Franklin L. Riley, “A Contribution to the History of the Colonization Movement in Mississippi,” Publications of the Mississippi Historical Society, vol. 9, pp. 345-348.)
You wrote: "The Mississippi legislature seriously debated an act requiring all free blacks in the state be forcibly deported to Africa."
I fail to see the specifics claimed. Not that it matters, the point is, that Africans, Egyptians, Russians, Europeans, Northerners, Southerers etc ALL had slaves at one time. Abraham Lincoln wanted to reward faithful blacks with a trip to Panama to dig a canal. Whatever law you can find in a southern state will probably have existed in some northern state. The South just wasn't hypocritical/sanctimonius about it - Yankees practiced slavery masked as indentured servitude in several states, no northern state wanted freed blacks, and they also wanted the territories reserved for whites only.