Compare and contrast the two types of authoritarian governments that arose after 1917

Compare and contrast the two types of authoritarian governments that arose after 1917, that is, communism and fascism. What were the origins of these governments, their accomplishments, and their failures? What accounts for the fact that the masses mobilized to support these movements? Elaborate.

his is the textbook. this is only a discussion post so 1/2 of a page single spaced to a whole page is enough!

Brower, D., & Sanders, T. (2014). The world in the twentieth century: From empires to nations (7th ed.). Boston, MA: Pearson.