Final answer:
The legal course of action when there is a conflict between a provision in a state constitution and a provision in the U.S. constitution is to challenge the state provision in court. The Supreme Court has the authority to declare state laws or provisions that conflict with the U.S. constitution as invalid or unconstitutional.
Step-by-step explanation:
When there is a conflict between a provision in a state constitution and a provision in the U.S. constitution, the legal course of action is to challenge the state provision in court.
The Supreme Court is the ultimate interpreter of the U.S. constitution and has the authority to declare state laws or provisions that conflict with the U.S. constitution as invalid or unconstitutional. The Supreme Court's decision in such cases supersedes the state provision.