correct answer to this is the event of:
Depression occured from 1929 to 1939, and was the most horrible economic recession
in the history. It started after the stock market crashed on October 1929,
which sent Wall Street into panic and erased millions of investors. This considerably
hanged the popular view of government’s appropriate role in the economy. The
Great Depression convinced a lot of people that the government had a role in
correcting for aggregate market failures and hence leading to a shift from Laissez-Faire
view towards a more activist view of the government.