<P> Marked by global instability and the Great Depression, the 1930s contended with several consequential European and Asian outbreaks of war, leading up to catastrophic World War II in 1939 . Other conflicts during the decade which affected the stock market included the 1936--1939 Spanish Civil War, the 1935--1936 Second Italo - Abyssinian War, the Soviet - Japanese Border War of 1939 and the Second Sino - Japanese War from 1937 . On top of that, the United States dealt with a painful recession in 1937 and 1938 which temporarily brought economic recovery to a halt . The largest one - day percentage gain in the index, 15.34%, happened on March 15, 1933, in the depths of the 1930s bear market when the Dow gained 8.26 points to close at 62.10 . However, as a whole throughout the Great Depression, the Dow posted some of its worst performances, for a negative return during most of the 1930s for new and old stock market investors . For the decade, the Dow Jones average was down from 248.48 points at the beginning of 1930, to a stable level of 150.24 points at the end of 1939, a loss of about 40% . </P> <Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (May 2014) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (May 2014) (Learn how and when to remove this template message) </Td> </Tr> <P> Post-war reconstruction during the 1940s, along with renewed optimism of peace and prosperity, brought about a 39% surge in the Dow from around the 148 level to 206 . The strength in the Dow occurred despite a brief recession in 1949 and other global conflicts which started a short time later including the latter stages of the Chinese Civil War, the Greek Civil War, the Indo - Pakistani War of 1947 and the 1948 Arab--Israeli War . </P>

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