Congress enacts a law prohibiting toys made in china from being sold in the united states. the hawaii state legislature enacts a law allowing the sale of chinese-made toys. hawaii's law will most likely be

Rendered irrelevant because of the supremacy clause

This clause posits that state laws will be subservient to the federal laws that are made in congress. It establishes that in the event of conflict between state and federal laws, federal laws shall supersede.

Hawaii's law will most likely be rendered invalid under the supremacy clause.

The Supremacy Clause establishes that the Constitution, federal laws made pursuant to it, and treaties made under its authority, as the supreme law of the land. State laws are thus subordinate to federal law.