Was dropping the atomic bombs on Hiroshima and Nagasaki a necessary use of force to end World War II? Objective Analyze primary and secondary sources to form a claim. Detect useful pieces of text evidence. Explain evidence and reasons with a clear line of reasoning. Orally defend a position amongst a group of peers. Recall and describe information from multiple sources. Background World War II officially began on September 1, 1939, when Nazi Germany invaded Poland. Soon countries from around the world were fighting the largest war the world has ever seen. There were two main groups of countrie