Taken from Wikipeida, "The United States Post Office Department (USPOD; also known as the Post Office or U.S. Mail) was the predecessor of the United States Postal Service, in the form of a Cabinet department, officially from 1872 to 1971. It was headed by the Postmaster General.
The Postal Service Act, signed by U.S. President George Washington on February 20, 1792, established the Department. Postmaster General John McLean, in office from 1823 to 1829, was the first to call it the Post Office Department rather than just the "Post Office." The organization received a boost in prestige when President Andrew Jackson invited his Postmaster General, William T. Barry, to sit as a member of the Cabinet in 1829.[1] The Post Office Act of 1872 (17 Stat. 283) elevated the Post Office Department to Cabinet status.
During the American Civil War (1861–1865), postal services in the Confederate States of America were provided by the Confederate States of America Post-office Department, headed by Postmaster General John Henninger Reagan.
The Postal Reorganization Act was signed by President Richard Nixon on August 12, 1970. It replaced the cabinet-level Post Office Department with the independent United States Postal Service on July 1, 1971. The regulatory role of the postal services was then transferred to the Postal Regulatory Commission."
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Taken from Wikipedia, "The William Jefferson Clinton Federal Building is a complex of several historic buildings located in the Federal Triangle in Washington, D.C., across 12th Street, NW from the Old Post Office. The complex now houses the headquarters of the Environmental Protection Agency (EPA).
One component of the complex was originally called the New Post Office, and housed the headquarters of the Post Office Department until that department was replaced by the United States Postal Service in 1971 and which vacated the building. Subsequently, the Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE) occupied this building, which Congress renamed as the Ariel Rios Federal Building in 1985. BATFE vacated the building in the early 1990s, and EPA moved in after a renovation.
To consolidate its headquarters offices, EPA also took occupancy of two adjacent buildings beginning in the late 1990s: the Interstate Commerce Commission (ICC) building and the Department of Labor Building, on Constitution Avenue, NW. In 2013 Congress renamed the Ariel Rios Federal Building in honor of former President Bill Clinton, and the General Services Administration extended the designation to the former ICC and Labor buildings. (The new BATFE headquarters building received the name Ariel Rios Federal Building in 2016.)"
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