And remember, always go to RegentsPrep.org or I have a great link on my website, hiphughes.blogspot.com, so you can check out some other ways of studying. But nevertheless, World War I in like 10 minutes. Here we go. The best way to remember the causes of World War I, World War I we're talking about 1914-15 to 1918-19, so it's about a four year war. Tens of millions of people are going to die in this war. It's a very hands-on, gritty, trench warfare, in-your-face war. I mean, you'd have 20,000 people die and they'd win 18 feet of land, so it's just nuts.