Frankly speaking, I’ve realized nothing new from the text about federalism and the Tenth Amedment. But, if my dear teacher asked me to write something, using new words, I’ve learned, surely, I would like to express the summary below. Pursuant to the text federalism is based on the powers’ division theory and appeared not today and even not 200 years ago. They consider that beginnig of federalism is found at ancient greek philosophers as Plathon, but similar phenomenon could be seen already in Roman Empire. I think federal system expressly inherits imperial (imperialistic) features, respectively, federal government has “supreme” powers and state powers look like “inferior”. But today national government in the USA has to act in response to some issues, only in cooperation with state government.Thus there are exclusive powers omny of the federal government and shared. ones, which are on a field of division between national and state government. Such called “dual soverenthy” is explicit refered to the 10th Amendment.