American Chronicles: The Art of Norman Rockwell
It's evident that dismissing Norman Rockwell as "merely" an illustrator is foolish. He captured life in the United States through bad times (the Great Depression and World War II) and good (the idyllic 50s), and, with the onset of the Civil Rights movement in the 1960s, uncomfortable and unjust. He did this with an unsparing, albeit often-humorous eye and perfect technical skills.
Snoopy first appeared in 1968. Since then he has been the most featured character in Thanksgiving Day Parade history, proving some things never really change.
Starting with the fact that it's not the world's oldest Thanksgiving Day Parade. That honor would belong to Philadelphia.