We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.

USHistory.org:

The Constitution gives three types of power to the national government:

1. Delegated (sometimes called enumerated or expressed) powers are specifically granted to the federal government in Article I, Section 8 of the Constitution. This includes the power to coin money, to regulate commerce, to declare war, to raise and maintain armed forces, and to establish a Post Office. In all, the Constitution delegates 27 powers specifically to the federal government.

2. Implied powers are not specifically stated in the Constitution, but may be inferred from the elastic (or “necessary and proper”) clause (Article I, Section 8). This provision gives Congress the right “to make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and other powers vested in the government of the United States.” Since these powers are not explicit, the courts are often left to decide what constitutes an implied power.

3. Inherent powers are not specifically listed in the Constitution, but they grow out of the very existence of the national government. For example, the United States has the power to acquire territory by exploration and/or occupancy, primarily because most governments in general claim that right.

The Constitution also identifies reserved powers, which are set aside for the states. Unlike delegated powers, they are not listed specifically, but are guaranteed by the Tenth Amendment: “The powers not delegated to the United States by the Constitution, not prohibited by it to the States, are reserved to the States respectively, or to the people.” Some traditional reserved powers include regulating trade within a state, establishing local government, and conducting elections.

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Prohibited powers are denied either to the national government, state governments, or both (Article I, Section 9.) For example, the national government cannot exercise its powers in such a way as to interfere with the states’ abilities to perform their responsibilities. States cannot tax imports or exports, nor can they coin money or issue bills of credit.

States also have responsibilities to one another, as explained in Article IV of the Constitution. One provision is that each state must give “full faith and credit” to the public acts, records, and civil judicial proceedings of every other state. Business contracts, then, are recognized by all states, as are marriages. Extradition, the legal process in which an accused criminal is returned to the state were the crime was committed, is also required by Article IV.