‘‘The powers not delegated to the United States by the Constitution,
nor prohibited by it to the States,
are reserved to the States respectively, or to the people.’’
U.S. Constitution, Amendment X
The Tenth Amendment is a "truism." It simply repeats -- almost needlessly -- the basic philosophy of the Constitution, which is a document of enumerated powers.
In Federalist 45, Madison described the relationship between the federal government and the states in these famous words:
The powers delegated by the proposed Constitution to the federal government, are few and defined. Those which are to remain in the State governments are numerous and indefinite. The former [powers delegated to the federal government] will be exercised principally on external objects, as war, peace, negotiation, and foreign commerce; with which last the power of taxation will, for the most part, be connected [e.g., tariffs]. The powers reserved to the several States will extend to all the objects which, in the ordinary course of affairs, concern the lives, liberties, and properties of the people, and the internal order, improvement, and prosperity of the State. [emphasis added]
And nobody believed that the state governments had the authority to nationalize production of computers, automobiles, and groceries. Government on all levels was tightly limited, and liberty extended to The People and their businesses.
Most government action should be local.
That used to be the American view.