NOTE: This thread is intended to celebrate the original version of Uncle Sam, who first received a regular comic book feature back in 1940.
This is NOT intended to be a thread about the later reimagining of the character by Justin Gray and Jimmy Palmiotti that resulted from the aftermath of 2005-2006's Infinite Crisis.
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The comic book hero called Uncle Sam first appeared in Quality Comics' National Comics #1, cover-dated July 1940.
His final Golden Age appearance as a feature appears to be in National Comics #45 (December 1944). Then, nearly thirty years later, Sam and several other former Quality Comics characters would be brought into DC Comics continuity in the pages of Justice League of America #107 (September-October 1973).