Final answer:
The 1920s are known as the Roaring Twenties due to economic growth, cultural advances, and individual prosperity. However, the decade ended with a crashing economy and the onset of the Great Depression.
Step-by-step explanation:
The 1920s are known as the Roaring Twenties because of the economic growth, cultural advances, and individual prosperity experienced during that time. It was a period of innovation and social change, characterized by jazz music, flappers, and illegal drinking. However, despite the celebratory atmosphere, serious economic problems were brewing, and by the end of the decade, the economy crashed, leading to the Great Depression.