What happened in the U. S. that caused a global economic slump?

The Great Depression started

Explanation:

Great Depression started in the United States after a major 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). Between 1929 and 1932, worldwide gross domestic product (GDP) fell by an estimated 15%.

answer; i believe two are ; /// world bank and international monetary fund; good luck

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