The document summarizes the key events and impacts of the Great Depression in the United States, which began with the stock market crash of 1929. The crash lasted six days and saw stock prices fall dramatically as millions of shares changed hands each day. This led to widespread unemployment that rose from 1.5 million to 15 million in just four years. Hardest hit was the agricultural industry, as farmers produced more than could be sold, leading many farms to go bankrupt. The economic decline and social impacts were severe, as poverty increased and many people were forced to live in shanty towns called "Hoovervilles".