<P> The Wall Street Crash of 1929, also known as the Stock Market Crash of 1929 or the Great Crash, is the stock market crash that occurred in late October, 1929 . It started on October 24 ("Black Thursday") and continued until October 29, 1929 ("Black Tuesday"), when share prices on the New York Stock Exchange collapsed . </P> <P> It was the most devastating stock market crash in the history of the United States, when taking into consideration the full extent and duration of its after effects . The crash, which followed the London Stock Exchange's crash of September, signalled the beginning of the 12 - year Great Depression that affected all Western industrialized countries . </P>

When did the wall street crash start and end
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