Select one major historical event from the 20th century (e.g., World War I, the Russian Revolution, the decolonization of India, or the fall of the Berlin Wall). Construct a multi-layered analysis of its causes that examines: 1) Structural causes (long-term political, economic, social, and technological factors); 2) Proximate causes (more immediate events and decisions); 3) The role of individual historical actors and their decisions; 4) Unintended consequences and contingencies that shaped outcomes; 5) How different historical schools of thought would interpret these causes differently; and 6) Which factors you consider most decisive and why. Your analysis should acknowledge the complexity of historical causality while making a reasoned argument about which factors were most important. Support your analysis with specific historical evidence and demonstrate awareness of historiographical debates surrounding your chosen event.