This article is good long-range information for naturalized citizens, and it's a good reminder for everyone.
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The 1 Big Mistake You Should Never, Ever Make With Your Passport
[...] "A lot of us just think we need a valid passport to travel the world beyond our borders, but what many people don't realize [is] that a current passport alone might not be enough," said Katy Nastro, a spokesperson for the flight alert service Going.
Indeed, many countries require your passport to have a certain duration of validity remaining beyond the intended dates of your trip. The most common lengths are three and six months past the date you fly back to the U.S. [...]
Continues:
https://www.yahoo.com/lifestyle/1-big-mistake-never-ever-111603933.html