The only things we need from the federal government are those enumerated in the constitution (about 18 items). The rest is left to the states and the people.
Yes.
And as the abuses grow and are observed to be nationally catastrophic, we added prohibition of slavery. We now must protect from the holocaust against innocent human life and it looks very likely we may need to assure that marriage is defined.
They knew and discussed the impled vs. enumerated (in human rights and govt. powers, both) and the solution was amendments, many of those we have coming immediately.