For the following question, assume the scenario is that there is a breach of contract lawsuit filed in Arizona's Maricopa County Superior Court for a contract entered into inArizona.

U.S. Supreme Court is:

a) Mandatory

b) Persuasive Authority

States are bound by the decision of the US Supreme Court on "US Constitutional and other issues of federal law".

So, somebody said that the Supreme Court of the United States is mandatory, but why? A breach of contract lawsuit is neither a federal nor a constitutional matter.

Thank you!