Question

A siesta is a nap in the middle of the day observed in the United Stats

Answer 1

That's a tricky question because while a "siesta" is indeed a nap that most do, it is not only done in the USA. So I would have to say the answer is TRUE if I were someone living in the USA. Hope that helps! 

Answer 2

Question: A siesta is a nap in the middle of the day observed in the United States.

Answer: This is very true. :)