Nast was a US caricaturist and cartoonist who defined the genre of the American political cartoon. During the American Civil War, Harper’s Weekly published the first of Nast’s serious political cartoons, which earned praise from President Lincoln. His stylized, clever, and forceful cartoons were instrumental in breaking up the corrupt New York City political machine of William Tweed. Nast popularized the use of what symbols in his depictions of the US Democratic and Republican parties? Discuss