There are a few different explanations for where Uncle Sam came from. The most popular story says he was named after Sam Wilson, a real-life meat packer who lived in Troy, New York. He did business with the American military during the War of 1812, shipping barrels off to hungry soldiers. To designate the containers as United States government property, they were labeled “U.S.” Troy residents joked that the “U.S.” really stood for “Uncle Sam,” which was—supposedly—Wilson’s nickname.
Many historians don’t buy this particular yarn (evidence has been uncovered for Uncle Sam being a nickname since 1810), but in 1961, Congress passed a resolution acknowledging Sam Wilson as “the progenitor of America’s national symbol of Uncle Sam.” He received another posthumous honor in the late ’80s. September 13, 1989—the 223rd anniversary of Wilson’s birth—was proclaimed “Uncle Sam Day” by then-President George H.W. Bush.