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.
âThe primary cause of the Great Depression,â reads the first sentence of President Herbert Hooverâs Memoirs, âwas the war of 1914â1918.â And that so-called Great War, along with the Depression it spawned, was the driver that eventually produced the even greater catastrophe of World War II.