These were not states in 1803 and there was no indication that Jefferson thought, except in your fevered brain, that they would enter, then leave the UNION.
Read it and weep.
"The future inhabitants of the Atlantic & Missipi States will be our sons. We leave them in distinct but bordering establishments. We think we see their happiness in their union, & we wish it. Events may prove it otherwise; and if they see their interest in separation, why should we take side with our Atlantic rather than our Missipi descendants? It is the elder and the younger son differing. God bless them both, & keep them in union, if it be for their good, but separate them, if it be better."
Jefferson's quote explicitly refers to their anticipated condition as STATES, explicitly refers to those states as part of the UNION, and explicitly refers to the possibility that they will leave that union. To deny this is to deny the text of the quote itself. But go ahead and make yourself look like an even bigger idiot. And why don't you tell everyone that "war is peace" and what the meaning of "is" is while you are at it.