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.
Home Great Depression & World War II 1920s: The Great Depression. The 1920â²s could be described as economic boom gone bust. The early 1900â²s began with an advancing industrial revolution and ended with the Stock Market Crash of 1929. The trigger that caused the great depression began with the boom in sales of stocks in a bull market. It continued for six months into the start of the Hoover Administration in January 1929.