what was the motivation and the purpose of the book burnings in Germany.

The purpose of the book burnings was to prevent Germans what the Nazis thought was subversive.

http://www.google.com/#q=+purpose+of+the+book+burnings+in+Germany

why where they called

"un-German" books,

The Nazis believed that they were the only "true" Germans. Anything they disagreed with was un-German.

The book burnings in Germany had a motivation rooted in both ideological and political factors. The primary purpose was to advance Nazi propaganda and suppress ideas that challenged or contradicted the Nazi regime's ideology and policies. It was part of their broader campaign to control information and shape public opinion.

To understand the motivation, you can delve into historical sources such as books, articles, or documentaries that explore the rise of the Nazi regime, their ideologies, and their plans for cultural manipulation. Examining primary sources such as speeches, writings, and policies from Nazi leaders like Adolf Hitler, Joseph Goebbels, and other key figures can provide insight into their motivations.

It is particularly important to consult reliable academic sources and historical studies that offer a balanced analysis of the events during that time. These sources present a factual and objective perspective on the motivations behind the book burnings and the broader Nazi propaganda machine. Look for books written by reputable historians specializing in this period, as well as documents from archives and testimonies of individuals who lived through that era.

Additionally, exploring the context of the book burnings in relation to Nazi policies, such as their pursuit of an Aryan supremacist ideology, their suppression of dissenting viewpoints, and their aim to control education and cultural expression, can provide further understanding.

Remember, understanding historical events like the book burnings requires a comprehensive approach, including examining primary and secondary sources, consulting expert opinions, and critically analyzing different perspectives.