In August of 1963, representatives of the United States, Soviet Union, and Great Britain all signed the "Limited Nuclear Test Ban Treaty." This treaty limited/prohibited the testing of nuclear weapons in outer space, underwater, or anywhere in the atmosphere.
9×sqr(x² - 144)/x² - 144
Click the picture for a better view
It would be federal, because federal rules and laws are what ALL of the states and citizens have to follow, or else there will be a punishment.
Then it is no longer a democracy, it is closer to a dictatorship. The democracy will fall