3. world war i ended in 1918, but the treaty of versailles left many issues unresolved and in 1939, world war ii began. in a brief essay, describe the major causes of world war ii, and explain how the response of the league of nations and of britain, france, and other european nations to axis aggression contributed to the start of the war.

2. identify the key people responsible for the development and use of the atomic bomb, and explain the arguments for and against the use of the atomic bomb.