I am not familiar with Thomas Jefferson demanding the removal of all blacks from the United States. I doubt it is true, but will give you the benefit of the doubt:
Please supply a source for this supposed fact.
Thank you very much.
Then let me enlighten you. From a December 26, 1820 letter to Albert Gallatin:
"Amidst this prospect of evil, I am glad to see one good effect. It has brought the necessity of some plan of general emancipation & deportation more home to the minds of our people than it has ever been before. Insomuch, that our Governor has ventured to propose one to the legislature. This will probably not be acted on at this time. Nor would it be effectual; for while it proposes to devote to that object one third of the revenue of the State, it would not reach one tenth of the annual increase. My proposition would be that the holders should give up all born after a certain day, past, present, or to come, that these should be placed under the guardianship of the State, and sent at a proper age to S. Domingo. There they are willing to recieve them, & the shortness of the passage brings the deportation within the possible means of taxation aided by charitable contributions. In this I think Europe, which has forced this evil on us, and the Eastern states who have been it's chief instruments of importation, would be bound to give largely. But the proceeds of the land office, if appropriated, would be quite sufficient."