uscis.gov

M71DK TIL that if you're a communist - or were in the past 10 years - the US prevents you from becoming a citizen
e0ogD TIL that as part of the Oath of Allegiance to the United States of America new citizens swear to "Bear arms on behalf of the United States when required by law."
mxdRy TIL there's an “Outstanding Americans by Choice” award to honor naturalized U.S. citizens who have made significant contributions to their community and country. “Recipients of this honor have demonstrated their commitment to this country and to the common civic values that unite us as Americans."