2. The assassination of Archduke Franz Ferdinand of Austria by Yugoslav nationalist sparked the first world war. This conflict involved all of the world's great powers, assembled in two opposing alliances: the Allies and the Central Powers. The type of warfare that was used was trench, chemical, and naval warfare. World War I end by the fallen empires of the Central Powers and the signing of the Treaty of Versailles. World War I
3. This war was a global military conflict lasting from 1939 to 1945. World war II started with Germany invasion of Poland and with the Holocaust. Most of the nation were involved including the great powers, there were two opposite alliances Allies and Axis The type of warfare used in WWII was Naval ,Air ,and Nuclear warfare The war end by the dead of Hitler and the bombing of Japan World War II