Both the Ninth and Tenth Amendments are designed to LIMIT the power of the federal government.
The Ninth Amendment (1791) contained a Bill of Rights to protect the individual's right and limit the central government, stating that the rights addressed weren't final and didn't deny or disparage the existence of other unenumerated rights, retained by the people.
As for the Tenth Amendment (1791), it granted the powers that the Constitution neither delegated to the federal government nor prohibited to the states, to the states, which basically meant that the states could establish their own laws as long as they weren't contrary to the federal government's laws.
Both the 9th and 10th amendments are designed to limit the power of the federal government.
