What happens when a state law conflicts with a federal law? The state law, under the Supremacy Clause, is declared invalid

The Federal law, under the Supremacy Clause, is declared invalid.

Article 6 of the Constitution encourages states to secede (leave the union).

Article 2 of the Constitution states that this situation will not occur.

When state law and federal law conflict, federal law displaces, or preempts, state law, due to the Supremacy Clause of the Constitution. ... For example, the Voting Rights Act, an act of Congress, preempts state constitutions, and FDA regulations may preempt state court judgments in cases involving prescription drugs

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