What effects did Hitler have on Germany

He expanded the army tremendously, reintroduced conscription, and began developing a new air force—all violations of the Treaty of Versailles. Hitler's military spending and ambitious public-works programs, including building a German autobahn, helped restore prosperity.

um is there supposed to be choices?

i believe it would influence their own way of understanding things. it shall be a foundation where they can draw or start an argument.   historians are also  scientists that  have their tools of analysis and expertise to unlock a variety of difficulties such as relationships of man, origin, politics, economy, and culture. based on facts and understanding on these areas, they may shade light to extract ideas and develop options to validate a hypothesis or debunk it.