In which John Green teaches you WHY World War I started. Or tries to anyway. With this kind of thing, it's kind of hard to assign blame to any one of the nat...
New Thinking on the Origins of World War I
World History - Causes of World War I
America in World War I: Crash Course US History #30
Was World War I the error of modern history?
World War I: Every Day
Who Started World War I: Crash Course World History 210