World War I had devastated and changed Europe in many different ways. Before World War I had started, tensions were already raised in Europe to the breaking point. Europe would soon be plunged into darkness and war with many casualties. The causes and effects of World War I vary into many different ways. There are many causes in World War I but one in particular to ignite the spark that would cause it all to unravel. Many different ethnic groups like the Slavic people of in Bosnia were under the control of Austria-Hungary but would rather be with Serbia or independent, they were furious. This is where nationalism, one of the most important factors of the war would come into effect to cause the war to start, because many different groups of people in Europe would rather be free than when under the control of larger countries. Imperialism would also set off a spark to initiate World War I. Many different European countries had control over colonies in Africa and Asia and were benefitting from them in their own ways while also gaining power. This set off countries to fight for the colonies and also creating the colonies to fight the motherland back to gain independence. Militarism allowed competition between each of the nations in Europe to compete and see which nation had a more developed army with more advanced technology. In the midst of all the trouble, to add up to all the heat, secret alliances were being formed to ensure backup if an outbreak of war were to occur. The spark to ignite it all and unravel the whole thing would be the assassination of Archduke Franz Ferdinand and his wife by a angered nationalistic 19 year old Slavic boy by the name of Gavrillo Princip. World War 1 had then started with much more to come. In the aftermath of the war, both negative and positive effects had taken place. European monarchies were being dismantled with more of democracy-like governments taking its place. The people of Europe neede