 
 <translate> The relevant information is: 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. The answer is 1971. <ibo> Ozi dị mkpa bụ: E kere Ngalaba Post Office na 1792 site na ọrụ Franklin, bulie ya na ngalaba ọkwa ụlọ ọrụ na 1872, wee gbanwee na 1971 n'ime US Postal Service dị ka ụlọ ọrụ nọọrọ onwe ya. Azịza ya bụ 1971. 