There were several long-term and short-term causes that led to the USA falling into depression in 1929. Long-term causes included overproduction of goods which led to falling demand, unequal distribution of wealth so most people couldn't afford goods, and tariff policies that isolated US trade. The short-term cause was the Wall Street crash in October 1929. This was precipitated by factors such as easy credit, lack of controls on stock market speculation, and advertising that encouraged consumer spending beyond means. When stock prices collapsed, it wiped out the savings of many and devastated the economy.