Answer:
By giving the federal government the right to override the legislature made by the state government.
Step-by-step explanation:
United States government allow both States and Federal government to create their own legislations as long as they do not violate the constitution.
But , before Peters v. Supreme court was held, people did not know what would happen if the legislations made by the state and federal were opposing one another.
In that case, the court determine that the Federal government held supremacy over the states government. This means that if they're opposing one another, the Federal government's should be prioritized. It could override any legislations made by the states