Conversation so far:
what powers did the constitution leave to the states
In the Tenth Amendment, the Constitution recognizes the powers of the state governments. Traditionally, these included the “police powers” of health, education, and welfare.
What was the purpose of the tenth amendament
The Tenth Amendment defines balance of power between the federal government and the states. The amendment says that the federal government has only those powers specifically granted by the Constitution

Question: What is one power not alowed in the amendment
Self-contained rewrite: What is one power not alowed  in the tenth amendment in the constitution