What factors led to the rise of Fascist and Communist regimes in the 1920s and 1930s?

What factors led to the rise of Fascist and Communist regimes in the 1920s and 1930s? You should address the long-term origins as well as the short-term (i.e. immediate) causes of these totalitarian regimes. Think about why fascism and communism took root in the time and place that they did. You have a good degree of flexibility in this essay, but the main goal is to be as specific and thorough as possible. This is not a formal essay, and you are not required to include direct quotes or citations. However, you must use very specific examples from both lectures AND supplemental source readings to prove your argument.