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Maine's correct USPS abbreviation has to be "ME" because it is a two-letter abbreviation used for all states in the United States. "MI" is the abbreviation for Michigan, "MA" is the abbreviation for Massachusetts, and "MN" is the abbreviation for Minnesota. These options would not be correct choices because they are already used for other states. Therefore, the correct option must be "ME" as it is not used for any other state and is the only correct choice for Maine's abbreviation.