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.
The stock market crash on October 29, 1929 set in motion a series of events that led to the Great Depression, but in fact, the American economy and global economy had been in turmoil six months prior to Black Tuesday, and a variety of factors before and after that fateful date in October caused and exacerbated the Great Depression.