1) The document discusses several key factors related to World War 1, including militarism, trench warfare, alliances, and the Treaty of Versailles.
2) Trench warfare involved both sides digging trenches for protection and to cut down on losses, but trenches posed problems like mud, rats, disease, and vermin.
3) The Treaty of Versailles created new countries from the former Austrian-Hungarian and Ottoman Empires, punished Germany, and formed the League of Nations.