What were the causes of the Great Depression of the 1930s? Why was it more severe and longer lasting than previous depressions?

1. What were the causes of the Great Depression of the 1930s? Why was it more severe and longer lasting than previous depressions?
2. What were the major developments in the economy of the Soviet Union during the 1920s and 1930s? In your opinion, which (if any) Soviet economic policies truly embodied socialist principles?
3. What political and economic alternatives did Hitler present to the German populace that allowed him to gain support over his more conservative opponents? Once in office, how was he able to convince a nation that the persecution of Jews was justified?
4. Describe how nationalism created social and political tensions in the successor states in eastern Europe. What recommendations you would have given the negotiators in Paris if you had been an advisor to the settlement talks.