The 10th Amendment says that the federal (national) government only has the powers listed in the Constitution. Any other powers belong to the state governments or directly to the people. The 10th Amendment states that the powers not given to the federal government belong to the states or to the people.
Section "Learn and Explore" uses official instructions and media files of US Citizenship and Immigration Services, US National Museum of American History, The Smithsonian Institution and other governmental and public organization.