Good advice has been given on things to do after obtaining the US citizenship by @OldUser and other members. Besides taking care of SSA, US passport, banks, broker aacounts and pension plans, I highly recommend to obtain the Global Entry card, its $120 for 5 years, but beiieve me, its worth every penny. You avoid long waiting hours at POE and mainly do not have to face undesirable interviews. Most people assume this privilege is limited to US citizens, it is also available to LPRs who are Citizens of Argentina, Colombia, Germany, India, Mexico, Panama, Singapore, South Korea, Switzerland, Taiwan, and the United Kingdom.