Paying federal taxes is required by law according to the Constitution (16th Amendment). All people pay money to fund federal government and important services, such as roads, schools, defense, and healthcare programs. Everyone who earns income above a certain amount must pay taxes as part of their civic duty.
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.