...to exercise like Authority over all Places purchased by the Consent of the Legislature of the State in which the Same shall be, for the Erection of Forts, Magazines, Arsenals, dock-Yards, and other needful Buildings;
These are the only legitimate constitutional ownings of the Federal Government that I can find. I see no authority for it to own half of Alaska, for example.
Agreed that was originally the case but since that time laws and acts have been passed creating many other Federal entities. Do I agree with all of them ??? No but they are law and until they have been judged unConstitutional we will live with them whether you or I like them or not.
Can the Federal government return back to performing only it’s explicit duties and obligations as delineated in the Constitution?? Yes but it will take at leaast a hundred years to undo the past 200 years of growth. That isn’t defeatism...that is reality.
As for owning half of Alaska, I agree with you but remember, it was the Federal government that bought all that land originally in the first place. Alaska is pretty much a creation of the Federal government (thank you Seward)