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United States Postal Service
independent agency of the U.S. federal government responsible for providing postal service / From Wikipedia, the free encyclopedia
The United States Postal Service (USPS) was founded in 1971, replacing the United States Post Office Department. Its headquarters is in Washington D.C. In the United States, it is referred to as "the post office", "the postal service", or just "the mail". Its job is to deliver letters, packages, and other items to people.
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United States citizens can use their mailbox flag to signal USPS drivers to deliver the mailbox's contents to a different place.