when was the united states postal service started
United States Postal Service The U.S. Mail traces its roots to 1775 during the Second Continental Congress, when Benjamin Franklin was appointed the first postmaster general. The Post Office Department was created in 1792 from Franklin's operation, elevated to a cabinet-level department in 1872, and transformed in 1971 into the U.S. Postal Service as an independent agency.
Post box [15] In 1971 the United States Postal Service changed mail collection boxes to the current USPS Dark Blue with contrasting lettering.[12][15][16] The coming of the automobile also influenced U.S. mailbox design, and in the late 1930s, an extension chute or "snorkel" to drive-up curbside collection boxes was adopted.[11]