The Great Depression (1929–1939) was a severe global economic downturn that affected many countries across the world. It became evident after a sharp decline in stock prices in the United States, leading to a period of economic depression. The economic contagion began around September 1929 and led to the Wall Street stock market crash of 24 October. This crisis marked the start of a prolonged period of economic hardship characterized by high unemployment rates and widespread business failures.