World War I was a war fought between July 28, 1914 and November 11, 1918. It was known as the Great War and in the United States people knew it as the European war. There were many casualties, both sides lost millions in total. It is well known that the First World War took place most of the time in the trenches where soldiers on both sides fought. New, extremely lethal technologies arose. It was the first time that a mass war was fought not only on land and sea, but also in the skies with airplanes and under the sea. The two sides were known as the Allies or Entente. These were mainly Great Britain, Italy, France, Russia, and later during the war, the United States came along. The Central Powers consisted of Germany, Austria-Hungary and the Ottoman Empire (Türkiye). A couple of smaller nations also decided to align themselves with the Allies or the Central Powers. In the Pacific, an island known as Japan decided to ally itself with the Allies because they wanted to take over the German colonies. The Allies defeated the Central Powers and were victorious. In 1917, the United States entered the war, bringing many troops to aid the Allies. They brought equipment that the Central Powers could not compete against. The war caused a change in the political landscape. There was the destruction of three empires: Ottoman, Austro-Hungarian and Russian. As a result, new boundaries were drawn. Due to the problems caused after the outbreak of the war, it was a cause that led to World War II. My goal in this article is to write about the First World War and the new technologies used. To achieve this, I have organized my article into five main sections. Casualties of Wor...... half of the document ...... American ships by the Germans and the Zimmerman note to convince Mexico to declare war on the United States pushed the United States to declare war on the Central Powers. When American troops collaborated with the Allies, the power in favor went to the Allies. After all the fighting, peace treaties were signed. The best known treaty was the Treaty of Versailles signed on July 28, 1919. These peace treaties were supposed to be an agreement by both sides to stop the fighting. In conclusion, World War I was a time of change. It brought new changes to the corrupt government and geography of Europe. New technologies were born. At the end of the war, the Treaty of Versailles was passed and all the blame was placed on Germany. They were forced to pay financial compensation. The war was horrible for all who fought in it. There were enormous losses. Over 16 and a half million people died.