Regardless of the kind of federalism, the Constitution does provide some very specific powers to both the states and the federal government. These powers are traditionally divided into three categories. Reserved powers are those that have been granted specifically to the states or are of a traditionally state scope. These consist mostly of police powers, such as providing fire and police protection, establishment of health regulations, licensing, and education. Granted powers, also known as express, enumerated, implied, delegated, and inherent powers, are those specifically listed in Article 1, Section 8, such as the power to coin money, to raise an army and navy, to provide for patent and copyright protections, to establish a post office, and to make treaties and war with other nations. An express, delegated, or enumerated power is one specifically listed; an implied or inherent power is one that exists to carry out an express or enumerated power. For example, Congress can raise an army; this implies the ability to specify regulations concerning who can join the army. Concurrent powers are those held to some extent by both the federal and state governments. Both, for example, have taxation power, the ability to construct and maintain roads, and other spending for the general welfare. Many things are denied of both or either levels of government. States, for example, have no authority to coin money or wage war or to pass a bill of attainder or any ex post facto law. Much of the Bill of Rights applies restrictions to both states and the federal government, while all of the Bill of Rights applies restrictions to the federal government. The Bill of Rights originally had no effect of restriction on the states, but judicial interpretation of the 14th Amendment's due process clause has incorporated much of the upholding of civil rights to the states.

ion, the United States became a confederation under the Articles of Confederation and when that system proved unsuccessful, it was transformed into a federal system by the Constitution.

Issues have come about federalism and its disadvantages also. As political orders go, confederal political arrangements pose peculiar problems concerning stability and trust. Federations tend toward disintegration in the form of secession, or toward centralization in the direction of a unitary state. Federations are often marked by a high level of ’constitutional politics’: Political parties often disagree on constitutional issues regarding the appropriate areas of sub-unit autonomy, the forms of cooperation and how to prevent fragmentation. Some still argue that democratic, interlocking federations alleviate such tendencies. Another central topic is the critical assessment of grounds for federal arrangements in general, and the allocation of authority between sub-units and central bodies in particular. A related important issue is who should have the authority to make such allocations and changes. The “Principle of Subsidiarity” has recently received attention. It holds that authority should rest with the sub-units unless allocating them to a central unit would ensure higher comparative efficiency or effectiveness in achieving certain goals. This principle can be specified in several ways, for instance concerning which units are included, which goals are to be achieved, and who ha

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