Final answer:
Prohibition was realized through the efforts of the rural Protestant segment, influenced by the Anti-Saloon League and the Social Gospel Movement, leading to the 18th Amendment.
Step-by-step explanation:
Prohibition was achieved by the political efforts of an economically declining segment of the Protestant rural population. This group held significant political power, especially in the Bible Belt of the South and Midwest, where local political candidates often required the endorsement of Prohibition organizations to win elections. By the early 20th century, the impact of the Anti-Saloon League and the influence of the Social Gospel Movement had grown to the point that many states enacted dry laws, culminating in the 18th Amendment which federally mandated Prohibition.