"Where America's Day Begins" territory (4)

I believe the answer is:

guam

(Other definitions for guam that I've seen before include "US island east of the Philippines" , "place in the Marianas" , "Largest of the Mariana Islands" , "Island in the West Pacific" , "North Pacific island, base for the US navy and air force" .)

I've seen this clue in the Universal.

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