The United States is a federal system because it has government at the state level that has its own responsibilities to the citizens and a government at the national level that has a different set of responsibilities to the same citizens. read more
There is probably an excellent example sitting in your wallet. If you are of age, you probably have a driver's license. That driver's license was most likely issued by your state. read more
A contemporary example is the debate surrounding the legalization of marijuana in the US. The US government claims supremacy in legal disputes regarding this matter, while (some) states believe that state’s rights supercede. read more