History: The Great Depression, 1939-1943, United States

In the 21st century, the Great Depression is commonly used as an example of how far the world's economy can decline. The depression originated in the U.S., starting with the fall in stock prices that began around September 4, 1929 and became worldwide news with the stock market crash of October 29, 1929 (known as Black Tuesday). From there, it quickly spread to almost every country in the world.
The Great Depression had devastating effects in virtually every country, rich and poor. Personal income, tax revenue, profits and prices dropped, while international trade plunged by more than 50%. Unemployment in the U.S. rose to 25%, and in some countries rose as high as 33%.
Cities all around the world were hit hard, especially those dependent on heavy industry. Construction was virtually halted in many countries. Farming and rural areas suffered as crop prices fell by approximately 60%. Facing plummeting demand with few alternate sources of jobs, areas dependent on primary sector industries such as cash cropping, mining and logging suffered the most.
Some economies started to recover by the mid-1930s; in many countries the negative effects of the Great Depression lasted until the start of World War II.