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/
Darrel Mulloy commented
If this one easy to understand amendment to the Constitution could be enforced, big government would go away. It should be the objective of every state government to see to it that the amendment is invoked.
Ken Creamer commented
See comments under cessation. the 10th Amendment also encompasses Union state Sovereiognty.