He was a fictional character. He was depicted on recruiting posters as being the ideal patriot that would die for hist country.
Because it was an attracting way to get people in the Army!
Stalin - Uncle Joe Stalin
Contact the Veterans Administration
The first War Propaganda Posters were mad in the Civil war and were quite striking. Uncle Sam (and other uncles) was developed then and used again in both World Wars. I really want you to see those posters so I have included pictures of these photos on the related link below.
My Uncle who flew during WW2 said they did it because you took care of your girl and she took care of you
Uncle Sam!
I WANT YOU. *pointing*
Uncle Sam
Uncle Sam wants you!
Uncle Sam
Uncle Sam wants you!
40 million
"Uncle Sam" .
The USA used Uncle Sam on their recruiting posters.
Because it was an attracting way to get people in the Army!
Uncle Sam .
In August of 1942, a new club was organized within the United Spanish War Veterans. The name of the club was "Uncle Sam's 1-2-3 Boys". The club was for USWV members who were veterans of the Spanish American War, and who had served or registered for military service in World War I and who had registered for selective service for World War II.