The 1920s is sometimes referre to as the "Jazz Age" or the "Roaring Twenties", usually when speaking about the United States. In Canada the decade is usually referred to as the "Roaring Twenties", much like in the United States. In Europe the decade is sometimes referred to as the "Golden Twenties". Since the closing of the 20th century, the economic strength during the 1920s has drawn close associations with the 1950s and 1990s, especially in the United States. These three decades are regarded as periods of economic prosperity, which lasted throughout almost the entire decades following a tremendous event that occurred in the previous decade (World War I and Spanish flu in the 1910s, World War II in the 1940s, and the end of the Cold War in the late 1980s).