World War I and II , short history, postwar and causal factors are summarized as based on existing historical facts. In history, the beginnings of World War I and II have caused damage, destruction and loss. Especially for humans and the environment. Millions of civilians are victims, the beautiful city order is destroyed. I do not know how many more victims due to this war are unknown. The following is a brief history of the beginning of World War I and II also a factor causing this global war.
The history of World War I (often abbreviated as World War I or PD 1) began in the years (1914-1918) by allied countries / unions. As; England, France, Russia, Serbia, Montenegro and Japan. Factors causing PD I, namely disputes with central countries. As; Germany, Austria, Hungary, and the Turkish sultanate. When the war is underway, Italy joins the Allies. Whereas Bulgaria joins the central countries.
Likewise in 1916 Portugal and Romania strengthened the allies of PD I. And in 1917, Greece declared war on the central side. The first neutral American, finally announced the war against Germany. PD I ended with victory on the part of the ally. After causing great misery and loss of lives about ten million died and twenty million others injured.
The Versailles, Saint-Germani, Trianon, Neuilly, and Sevres peace agreement that ended this First World War. Successfully changed the face of Europe radically. To maintain peace, the League of Nations was formed (General Encyclopedia, 1973: 991-2) .