C. Poe wanted to challenge social conformity and change the outlook on how people reacted to certain events. If you look a lot of his writing was dark and often gruesome. Do to this he was able to change the way writers transitioned their work, he also help classify the first detective workings as well as begin the science fiction genre.
A. Barnum employed outrageous stunts, repetitive advertising, and exaggerated publicity to excite international attention for such amusements as the public museum, the musical concert, and the three-ring circus.
b. Bailey, he made the American circus a popular and gigantic spectacle, so-called The Greatest Show on Earth.