Why where the Nazis important in The Devils Arithmetic book?

In "The Devil's Arithmetic," the Nazis are crucial as they represent the oppressive forces responsible for the Holocaust, which is central to the story's themes of memory and remembrance. The protagonist, Hannah, is transported back to a Jewish village during World War II, where she experiences the realities of Nazi persecution firsthand. This historical context emphasizes the importance of remembering the past to honor those who suffered and to prevent such atrocities from happening again. The Nazis serve as a stark reminder of the consequences of hatred and intolerance.