The document summarizes several key factors that contributed to the outbreak of World War 1: 1) Militarism - European powers including Germany, France, and Russia greatly expanded their armed forces in the decades leading up to 1914. 2) Alliances - By 1914, the major European powers were locked into a system of alliances that drew more countries into a localized conflict. 3) Imperialism and nationalism - The European powers competed for overseas colonies and territory, fueling nationalist sentiments. 4) Significant individuals - Key leaders such as the German Kaiser and Austrian and German leaders helped propel Europe into war through aggressive actions and support for allies. 5) The July Crisis - The assassination of