Answer:
They used death marches in order to hide the proof that the Holocaust happened or at least that it wasn't as bad as it was. In 1945 the Germans were decisively losing the war so the SS organized the so-called death marches. They were most likely called death marches by the prisoners and not the SS. They evacuated the camps to keep prisoners from getting liberated.
It prolonged the war because once they dug in they would slowly move forward every few days. It also kept them from having more head on conflicts and doing so prolonged the war effort.
Explanation:
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