The 1920s (pronounced "nineteen-twenties" often shortened to the "20s" or the "Twenties") was a decade that began on January 1, 1920, and ended on December 31, 1929. In America, it is frequently referred to as the "Roaring Twenties" or the "Jazz Age", while in Europe the period is sometimes referred to as the "Golden Twenties" because of the economic boom following World War I (1914–1918). French speakers refer to the period as the "Années folles" ("Crazy Years"), emphasizing the era's social, artistic, and cultural dynamism.