Myth: It is okay for government to do things because it is for our own good and many other very good reasons, or it is within the American tradition or something.
Truth: The Tenth Amendment says if a power has not been delegated to the federal government it simply does not have it.
In that case, as Justice Thomas correctly said in his trenchant dissent in U.S. Term Limits v. Thornton (1995), it becomes a question of state law whether the power is held by a state or, failing that, by the people, having never been granted to either government.
The Constitution (preamble and 10th Amendment) states that all government in America receives its authority from the American people. For this reason the American people and individual states have the right to do anything that is not specifically banned by the laws they gave the government permission to create. Likewise the Federal and state governments only have the ability to do the things that they have been given permission to do under the US Constitution and the individual state constitutions.
Most of the enumerated powers granted by the U.S. Constitution to the federal government are found in Article 1, Section 8:
The Congress shall have Power To lay and collect Taxes, Duties, Imposts and Excises, to pay the Debts and provide for the common Defence and general Welfare of the United States; but all Duties, Imposts and Excises shall be uniform throughout the United States;
- To borrow money on the credit of the United States;
- To regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribes;
- To establish an uniform Rule of Naturalization, and uniform Laws on the subject of Bankruptcies throughout the United States;
- To coin Money, regulate the Value thereof, and of foreign Coin, and fix the Standard of Weights and Measures;
- To provide for the Punishment of counterfeiting the Securities and current Coin of the United States;
- To establish Post Offices and Post Roads;
- To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries;
- To constitute Tribunals inferior to the supreme Court;
- To define and punish Piracies and Felonies committed on the high Seas, and Offenses against the Law of Nations;
- To declare War, grant Letters of Marque and Reprisal, and make Rules concerning Captures on Land and Water;
- To raise and support Armies, but no Appropriation of Money to that Use shall be for a longer Term than two Years;
- To provide and maintain a Navy;
- To make Rules for the Government and Regulation of the land and naval Forces;
- To provide for calling forth the Militia to execute the Laws of the Union, suppress Insurrections and repel Invasions;
- To provide for organizing, arming, and disciplining, the Militia, and for governing such Part of them as may be employed in the Service of the United States, reserving to the States respectively, the Appointment of the Officers, and the Authority of training the Militia according to the discipline prescribed by Congress;
- To exercise exclusive Legislation in all Cases whatsoever, over such District (not exceeding ten Miles square) as may, by Cession of particular States, and the acceptance of Congress, become the Seat of the Government of the United States, and 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; And
- To make all Laws which shall be necessary and proper for carrying into Execution the foregoing Powers, and all other Powers vested by this Constitution in the Government of the United States, or in any Department or Officer thereof.



[...] by the consent of the governed, and the U.S. Constitution only gave the federal government certain enumerated powers, the rest being reserved to the states or the people. One of the key problems we face today is [...]