In the spirit of What shall one do after receiving a green card?, I wonder: What shall one do after becoming a US citizen?
One step is getting the US passport (not compulsory but useful in some cases eg if one wishes to travel). What else?
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Generally during the naturalization ceremony you'll get some flyers from the USCIS and other agencies listing what they suggest you do.
Things that come to mind:
Things you've probably done when getting your green card, but should do now if you haven't: