In what year did the First World War begin?

The First World War began on July 28, 1914 and ended on November 11, 1918. It became one of the bloodiest wars in world history. The reason was the assassination of the heir to the Austrian throne, Archduke Franz Ferdinand and his wife. If we talk about the reasons, then it can be argued that serious economic contradictions between the countries contributed to the outbreak of world war. A conflict ensued between Austria and Serbia. Germany supported Austria and entered the war. A total of 38 countries participated.