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.
Few events in U.S. history can rival the Great Depression for its impact. The period from 1929 to 1941 saw fundamental changes in the landscape of American politics and economics, including such monumental events as America âs going off the gold standard and the founding of Social Security.