The power was never given to the Federal Government to conduct that kind of sale.
If the power is not in there and enumerated, it doesn't exist.
That's what prevents them from doing it.
That argument is fallacious and of the same type that Jefferson used when declaring that the US could not make the Louisiana Purchase. Fortunately Madison convinced him to shut up and buy it.
Hamilton outlined what makes an act constitutional or not in the Essay on the National Bank. If you are truly interested in this issue you should read that document. It is a brilliant analysis.
The power to tax individuals in the states, prohibit sale of alcohol in the states, or require states to allow women or blacks to vote in their states was never in the Constitution either until 2/3 of congress and 3/4 of the states said it would be.
If the Union of the States is not perpetual, there is nothing that prevents 2/3 of Congress and 3/4 of the states from expelling other states from the Union.
Read Madison and see what he thought about your unilateral secession BS.