Watch Crash Course World History Season 2 Episode 9 Online

In which John Green teaches you about World War I and how it got started. Crash Course doesn't usually talk much about dates, but the way that things unfolded in July and August of 1914 is kind of important to understanding the Great War. You'll learn about Franz Ferdinand, Gavrilo Princip, the Black Hand, and why the Serbian nationalists wanted to kill the poor Archduke. You'll also learn who mobilized first and who exactly started the war. Sort of. Actually, there's no good answer to who started the war, but we give it a shot anyway.