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.
1. The Great Depression was an economic slump sparked by the collapse of the New York stock exchange in 1929. 2. It devastated the US economy, caused unemployment to soar and created significant social suffering. 3.