The correct answer is option 4: Great Depression. The collapse of Wall Street refers to the stock market crash that occurred in 1929, triggering a severe economic downturn known as the Great Depression. This event had far-reaching negative consequences, causing a massive decline in industrial production, widespread unemployment, and a sharp decline in global trade. It is important to note that the collapse of Wall Street did not directly lead to World War II or the U.S. attack on Iraq. While the collapse did contribute to a global recession, it is more accurate to say that the recession was a consequence of the Great Depression rather than the collapse itself. Overall, the Wall Street collapse was a significant event that marked the beginning of a decade-long economic crisis.