 
 <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. <hau> Bayanan da suka dace sune: An kirkiro Ma'aikatar Post Office a 1792 daga aikin Franklin, wanda aka daukaka zuwa sashen matakin hukuma a 1872, kuma ya canza a 1971 zuwa sabis na gidan waya na Amurka a matsayin hukuma mai zaman kanta. Amsar ita ce 1971. 