It's too late, since your paper is done (congrats on the A), but for the record I wanted to throw out two points:
1. The stage for the Great Depression was set by money expansion, but we should recall the circumstances. In any war, the first thing to go is the gold standard, as it limits the amount of munitions the government can produce (confiscate). In WWI, all the European nations went off the gold standard, while the US remained on it. This set up a solid flow of gold from EU to US, in exchange for munitions. By 1920, the US had almost all the gold in the world, while the EU nations suffered from hyperinflation. After the war, the EU nations went back to the gold standard BUT AT THE PRE-WAR RATE OF EXCHANGE -- a tremendous mistake that Mises warned them against. Because of the preceding 10 years of inflation, the price structure was tremendously altered, and going back to gold at the pre-war parities put incredible deflationary pressure the currencies that did so (i.e. since they set the price of money too low, all other prices had to adjust downwards). However, unions fought to keep the wage where it was (i.e. too high given the deflation), resulting in mass unemployment. The fact that the US had all the gold also gave them an opportunity to set up the dollar as the center of the world's monetary system (EU central banks wanted to buy gold back, we refused and sent them dollars instead), resulting in the twisted fiat currencies we currently live with.
2. The importance of the Smoot-Hawley Tariff Bill of 1930 (passed in 1929) cannot be overstated. Jude Wanniski's The Way the World Works provides a daily timeline of the passage of the bill compared to the stock market, and it matches up perfectly. The malinvestment blew up the bubble, but the SHT was the pin that popped it.
"He that struggles with us strengthens our nerves, and sharpens our skill. Our antagonist is our helper." Edmund Burke