Which aspect of life during the 1920's most likely caused the decade to be labled the Roaring Twenties?

The Roaring Twenties was starkly different from the pallid Victorian age that dominated the decade before. During the 1920's, Prohibition was in full force, but so was organized crime and jazz music. It was an era that followed the war, and was a time of "disenchantment", as chronicled in F. Scott Fitzgerald's novels.