The United States Postal Service (originally called the U.S. Post Office Department, when it was completely managed by the U.S. Government before 1971) also known as the Post Office, U.S. Mail, or Postal Service is an independent agency of the United States federal government responsible for providing postal service in the United States. It is one...
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http://en.wikipedia.org/wiki/United_States_Postal_Service
(from the article `postal system`) ...the U.S. Congress approved the Postal Reorganization Act of 1970, signed into law Aug. 12, 1970. The act transformed the Post Office Department ... ...helped, but the low altitudes at which most contemporary planes could operate continued to plague service. Commercial flying began in earnest in ... ...
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http://www.britannica.com/eb/a-z/u/12
US Postal Service noun an independent federal agency that provides mail processing and delivery service for individuals and businesses in the United States
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https://www.encyclo.co.uk/local/20974
an independent federal agency created in 1971 by the Postal Reorganization Act to replace the Post Office Department as the division of the federal government responsible for postal services. Abbr.: USPS
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https://www.infoplease.com/dictionary/united-states-postal-service
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