Cnidaria is a phylum within Kingdom Animalia which consists of hydras, jellies (or jellyfish), sea anemones, and corals. All cnidarians are radially symmetrical, and there are two main radially symmetrical body types.
The stock market crash, on black Tuesday (October 29, 1929) began the Great Depression.
Great Depression Timeline. 1  October 29, 1929: The U.S. stock market crashed in a catastrophic economic disaster.  November 1929:President Herbert Hoover is quoted as saying, Any lack of confidence in the economic future or the basic strength of business in the United States is foolish..