The document outlines several key causes of World War 1: militarism led European powers like Germany and Russia to rapidly expand their armed forces, the system of alliances meant local conflicts could escalate into an international war, imperialism and nationalism increased tensions, and aggressive leaders like Kaiser Wilhelm II helped push countries towards conflict. The assassination of Archduke Franz Ferdinand provided the spark that ignited the powder keg of military buildups, nationalist tensions, and overlapping alliances that led Europe into the first modern world war.