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.
October 29, 1929. The stock market crash of October 1929 led directly to the Great Depression in Europe. When stocks plummeted on the New York Stock Exchange, the world noticed immediately.