The Ninth Amendment (1791) declares that individuals have other fundamental rights, in addition to those stated in the Constitution. During the Constitutional ratification debates Anti-Federalists argued that a Bill of Rights should be added. One of the arguments the Federalists gave against the addition of a Bill of Rights was that, because it was impossible to list every fundamental right, it would be dangerous to list just some of them, for fear of suggesting that the list was explicit and exhaustive, thus enlarging the power of the federal government by implication.
The Anti-Federalists persisted in favor of a Bill of Rights, and consequently several state ratification conventions refused to ratify the Constitution without a more specific list of protections, so the First Congress added what became the Ninth Amendment as a compromise. Because the rights protected by the Ninth Amendment are not specified, they are referred to as "unenumerated". The Supreme Court has found that unenumerated rights include such important rights as the right to travel, the right to vote, the right to keep personal matters private and to make important decisions about one's health care or body.
The Tenth Amendment (1791) was included in the Bill of Rights to further define the balance of power between the federal government and the states. The amendment states that the federal government has only those powers specifically granted by the Constitution.
These powers include the power to declare war, to collect taxes, to regulate interstate business activities and others that are listed in the articles or in subsequent constitutional amendments. Any power not listed is, says the Tenth Amendment, left to the states or the people. While there is no specific list of what these "reserved powers" may be, the Supreme Court has ruled that laws affecting family relations, commerce that occurs within a state's own borders, and local law enforcement activities, are among those specifically reserved to the states or the people.