I want to know the answer to the following question:
What determines the speed in which mail reaches Guam from the United States?
All the background I'm provided with is that "Incoming mail not from the Americas should be addressed to "Guam" instead of "USA" to avoid being routed the long way through the U.S. mainland and possibly charged a higher rate (especially from Asia).". Is that enough to answer the question?
Answer: no