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)
Jefferson bought the Louisiana Purchase and opened it up for Americans. He understood that the Federal government is the people and not a corporate business interest.