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.
Primary sources are the first hand evidence left behind by participants or observers at the time of events. Primary sources originate in the time period that historians are studying. They vary a great deal.
Primary vs. Secondary Research. When performing research, most writers will come across a variety of information from a variety of different places. All of these sources can be classified as either primary or secondary sources. Primary Source: A primary source is an original study, document, object, or eyewitness account.