Which are secondary sources? Select three options. documentary about the Great Depression textbook chapter about economic markets book of historical fiction written about Dust Bowl refugees letter home written by someone during the Great Depression Osigned federal law aiding people affected by the Great Depression

Which statement best describes a significant cause of world war ii? o a. the economic boom that followed world war i allowed countries to build up huge militaries. o b. the treaty of versailles, which ended world war i, left lasting resentments in many countries. o c. the rise of imperial states in asia caused european powers to unite for their common defense. o d. the league of nations encouraged european states to form secret military alliances.