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.
What were the top causes of the Great Depression in the United States? Here is a list from the stock market crash of 1929 to widespread drought. Top 5 Causes of the Great Depression