The Stock Market crash in 1929, that began the Great Depression. On October 29, 1929, Black Tuesday hit Wall Street as investors traded 16 million shares on the New York Stock Exchange in a single day. The aftermath of The Stock Market crash (Black Tuesday), America and the rest of the world spiraled down into the Great Depression (1929-39), this was the deepest, and the longest-lasting economic turn in the history of the Western world up to that time.