Answer: The 9th and 10th amendments assert that the people and the states retain any rights not delegated to the federal government in the Constitution.
Further detail:
The 9th amendment asserts that the Constitution has not attempted to list all the rights that individuals have, and affirms that the people have rights that are not all listed within the Constitution.
The 10th amendment affirms that the Constitution is the law of the United States, but that states themselves are free to establish their own constitutions and laws, as long as they are not in conflict with the US Constitution.
Here's the wording of those two amendments:
- 9th Amendment: The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people.
- 10th Amendment: 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.