With this imagery, Uncle Sam begged Americans to join the fight in 1917 as the US deployed into the first world war. It was so popular, he used it again the second time around. The Uncle Sam nomenclature supposedly stems from a packer who supplied meat to the Army in the War of 1812, Sam Wilson. Ironically, he's remembered as a man of great fairness and honesty.
Tags: uncle-sam, trump, donald, clinton, hillary