The Sinking of the Lusitania and the Zimmerman telegraph
Allied and Central Powers
On June 28, 1914, Franz Ferdinand, Heir to the Austro- Hungarian throne is assasinated by Gavrilo Princip, A member of the "Black Hand". The "Black Hand" are a secret society that wanted Serbia to break away from Austria - Hungary and join Yugoslavia.
New Technology and Trench Warfare
On May 7, 1915, the RMS Lusitania was sunk by a German U-boat. The ship had been carrying over 4 million round of ammunition, along with almost 2000 passengers, including some Americans. This turned the opinion in the US about the war against Germany. In January 1917, a telegraph sent from Germany to Mexico was intercepted by America. In the telegraph, the Germans asked the Mexicans to go to war with the US and promised them land. This telegraph caused the US to enter WW1 against Germany and the Central Powers.
The Armistice of November 11, 1918
There were two alliances during World War One, the Allied Powers (Left) and the Central Powers (Right). The problem with these alliances, is when there is a war between two countries on opposite sides, their allies go to war to support them, and escalate the war. The Central Powers include Germany, Austria-Hungary, and the Ottoman Empire. The Allies include Britain, America, France, and Italy (Italy was more minor). Russia was originally in the Allied powers, but left after the Bolshevik Revolution and the creation of the USSR.
The Treaty of Versailles
Many new technologies were used during the war, including machine guns, tanks, poison gases, semi-automatic rifles, and barbed wire. These new technologies combined with the first wide- spread use of trench warfare made moving forward very bloody, requiring hundreds of people to run across open, barbed wire covered fields while being mowed down by machine guns.
The November 11, 1918 armistice ended the fighting during WW1. Germany signed the armistice because their defenses had crumbled and they had realized that they had no chance of winning the war. The armistice is also known as the Armistice of Compiegne. The armistice required Germany to move all of their troops behind the rhine river, and to surrender airplanes, warships, and military supplies.
The Treaty of Versailles (not Paris) of June 28, 1919 officially ended WW1. The treaty forced Germany to disarm themselves, give up all of the parts of the USSR, Poland, Belgium, Denmark, Czechoslovakia, Lithuania, and France that they had controlled, their vast colonies is Africa and Asia were transferred to other countries, and they had to admit that the war was the fault of the Central Powers, and pay 132 billion Marks (worth $31.4 Billion then, and $442 billion now). The treaty was signed by Germany, Britain, America, Italy, and Japan.