Final answer:
Billy Sunday hoped to revive Protestant fundamentalism and support social reforms such as prohibition through his influential evangelism, which attracted large crowds and significant support.
Step-by-step explanation:
Billy Sunday was a prominent evangelist during the early 20th century who aimed to revive 'old-time' Protestant fundamentalism and advocate for social reforms like prohibition. With his background as a celebrated baseball player, Sunday transitioned into religious evangelism, gaining immense popularity and influence. He rallied Americans around fundamentalist religion, earning the support of wealthy and powerful families, and addressed significant social issues of the time, ultimately shaping public opinion and policy through his charismatic preaching.