The correct answers are
-Wartime production ceased resulting in mass unemployment.
-Americans invested widely in stock markets.
-Countries issued to many war bonds during WW1.
-US stock market crashes.
Those were four reasons for the Greta Depression.
On October 29, 1929, the United States stock market crashed, initiating the period known as the Great Depression. It was one of the worst economic moments in the history of the United States. Millions of people lost their jobs, many companies had to close, and banks went into bankruptcy. The economic depre4ssion spread to many countries, included European countries that were in debt due to the many expenditures during the war and the poverty and destruction that remained after it.