Final answer:
Approximately 16,410,030 shares were sold on the stock market on October 23rd, 1929. President Hoover's attempts to restore Americans' confidence in the stock market were not successful.
Step-by-step explanation:
On October 23rd, 1929, known as Black Tuesday, approximately 16,410,030 shares were sold on the stock market. This marked the beginning of the stock market crash and the Great Depression in the United States.
During this time, President Herbert Hoover tried to restore Americans' confidence in the stock market by making statements to downplay the severity of the situation. However, his attempts were largely unsuccessful, as the economic crisis continued to deepen.
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