Reciprocity. The states cannot tax federal issues and the federal government cannot tax state issues.
The U.S. Food and Drug Administration (FDA) is the federal agency that issues the Model Food Code.
If issues cannot be setteled among the federal courts, the case will move to the Supreme Court. This is the highest court in the land and settle issues regarding separations of power.
Federal Drug Administration
The Federal Trades Commission.
Paper money is issued by the Federal Reserve.
Presidents for Federal crimes, governors for state crimes.
In the United States the federal agency responsible for safety-related issues of nuclear energy is the NRC (Nuclear Regulatory Commission).
There are three levels of federal courts. U.S. District Court - U.S. Courts of Appeal - The U.S. Supreme Court.
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OSHA
Federal courts have jurisdiction over cases that involve federal law. There are also a few jurisdiction issues that could bring a state law case into federal court.