The federal government’s role is supposed to be small within the country, according to the rule of law, and not involved in most of what it does.
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The Tenth Amendment:
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.
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“Another not unimportant consideration is, that the powers of the general government will be, and indeed must be, principally employed upon external objects, such as war, peace, negotiations with foreign powers, and foreign commerce. In its internal operations it can touch but few objects, except to introduce regulations beneficial to the commerce, intercourse, and other relations, between the states, and to lay taxes for the common good. The powers of the states, on the other hand, extend to all objects, which, in the ordinary course of affairs, concern the lives, and liberties, and property of the people, and the internal order, improvement, and prosperity of the state.”
– Joseph Story 1833 (source)