"Arguably America's most substantive role in World War II was supplying the sheer material preponderance that eventually overwhelmed the much more aggressive and better trained German and Japanese forces. This is one of the first posters that mobilized Americans and made them aware of one way they could help to end the bloodshed. Carlu worked in the United States from 1939 to 1952. When he first submitted this design, in the pre-Pearl Harbor summer of 1941, it was a mobilization poster; it became a war poster when it was reissued in 1942."- Posterpro (eBay).