World War I The First World War is also known as the Great War that ended all wars. The First War World began on August 4, 1914, when German troops poured into Belgium. When American first have knowledge of the military tension in Europe, they wanted to stay out of the war and declared neutrality. Many believed that the First World War is caused by nationalism, imperialism, militarism, and the system of alliances. As national interests and national unity grew in Europe and the development of the armed force, jealousies, and fears led nations in Europe to sign treaties of alliances to support each other in case a country is attackedby another. By 1914, there were two major mutual-defense alliances called the Triple Entente and the Triple Alliance. The Triple Entente is also later known as the Allies; consist of France, Great Britain, and Russia. However, Russia also had a separate treaty with Serbia which later plays an important role in the war in Europe. The Triple Alliances consisted of Germany, Austria-Hungary, and Italy. But Italy would later join the Allies in return for territorial acquisition. The Triple Alliances would later be known as the Central Powers with Germany, Austria Hungary, and the Ottoman Empire, an empire that is mostly controlled by Turks. The alliances would prove vital because it serve as a national security and the balance of power in Europe. On June 28, 1914, the Archduke Franz Ferdinand, nephew of the Emperor Franz Joseph, was assassinated by Gavrilo Princip in Sarajevo, Bosnia. Princip was a member of the secret society called the Black Hand. The society objective is to unite all Serbs under one government, including all Serbs that are living in Bosnia. The assassination led to a diplomatic disaster that led to Austria-Hungary declaration of war against the Serbs. As soon as the war started, the alliance system pulled one nation after another into the conflict. The war in Europe divided many public opinions here at home including...