The Tenth Amendment to the United States Constitution is a part of the Bill of Rights and was ratified on December 15, 1791. The purpose of this amendment is to clarify how the federal governments powers should be interpreted and to reaffirm the nature of federalism. The text of the Tenth Amendment states that "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".

The Tenth Amendment helps to define the concept of federalism, which is the relationship between the federal and state governments. It confirms that the federal government only has the powers that are specifically granted to it by the Constitution, and that all other powers are reserved for the states or the people.

The Tenth Amendment has been used as a tool for invoking nullification, which is the invalidation of any federal laws that a state has deemed unconstitutional with respect to the United States Constitution. It has been successfully utilized to nullify federal laws pertaining to gun rights, immigration, cannabis, and more.

In summary, the Tenth Amendment to the United States Constitution clarifies how the federal governments powers should be interpreted and reaffirms the nature of federalism. It confirms that the federal government only has the powers that are specifically granted to it by the Constitution, and that all other powers are reserved for the states or the people.