World War 1 was the first war to affect almost every part of the world. This war was the first to include mass trench warfare, the concept of total war, and was a war that caused millions of deaths. It was caused by a rigid pair of global treaties that were bound to break at the slightest disturbance. It led to years of war, deaths, and internal struggles within the fighting countries. It also emerged the US as the frontrunner in military dominance and economic strength.