On October 29, 1929, known as Black Tuesday on Wall Street, investors traded about 16 million shares on the New York Stock Exchange in one day, and billions of dollars were lost, eliminating thousands of investors.

In the wake of Black Tuesday, America and the rest of the industrial world entered the Great Depression (1929-1939), the deepest and longest period of economic downturn in the history of the Western industrial world up to that time, the 1929 stock market crash During the 1920s, the stock market underwent in The United States of America rapidly expanded and reached its climax in August 1929.

After a period of random speculation, and this was accompanied by low production rates and a high level of unemployment, which made the shares greatly increase from their real value. Among the other reasons for the market collapse were low wages and the spread of debts, and the agricultural sector was struggling, and there was a surplus of large bank loans that could not be liquidated, Share prices began to decline in September and early October 1929, and on October 18 the decline began, and panic began to appear, and on October 24, known as Black Thursday, 12,894,650 shares were traded.

Investment companies and prominent bankers tried to stabilize the market by buying large amounts of shares, which led to a moderate rally on Friday, and things came back again on Monday, the markets began to fall, and Monday followed, Black Tuesday (October 29), The entire stock price collapsed and 16,410,030 shares were traded on the New York Stock Exchange in one day.

Billions of dollars were lost, which led to the elimination of thousands of investors, and stock indexes stopped working for hours due to the inability of the mechanism to deal with the huge trading volume, the collapse of the inch and the great depression after the day of October 29, 1929 AD, stock prices were not moving, and in the hope that there is a recovery Significant over the subsequent weeks, and in general prices continued to fall as the United States declined and entered the Great Depression, and by 1932 the value of shares was only 20% of their value in the summer of 1929.

The stock market crash of 1929 was not the only cause of the Great Depression, but it accelerated the global economic meltdown that was also a symptom of the Great Depression. By 1933, nearly half of American banks had failed completely in the face of the crisis, and unemployment was approaching 15 million people, or 30% of the workforce, and reform measures by the administration of US President Franklin D. Roosevelt (1882-1945) helped mitigate the effects of the Great Depression, However, the American economy did not fully recover until 1939 AD, when World War II (1939-1945) broke out and American industry was revitalized.