The Treaty of Versailles in the mind of the Germans stabbed them in the back, especially the guilt clause that made them take blame for the First World War. Hitler capaitalized on these sentiments and used them to rally the German people.
Secondary Sources are materials that digest, analyze, evaluate and interpret information contained within primary sources or other secondary sources. Examples. 1  Autobiographies, memoirs, diaries, emails, oral histories.  Letters, correspondences, eyewitnesses.
Historians use a wide variety of sources to answer questions about the past. In their research, history scholars use both primary sources and secondary sources. Primary sources are actual records that have survived from the past, such as letters, photographs, articles of clothing. Secondary sources are accounts of the past created by people writing about events sometime after they happened.