Why was mary cassatt a trailblazer?

What makes Mary Cassatt a trailblazer

Both Wiesel's All Rivers Run to the Sea and Spiegelman's Maus relate events of the Holocaust from a Jewish survivor's perspective. They are both told in first-person point of view, from the perspective of a Jewish person who has gone through the Holocaust and survived the ordeal. So both stories are told straight from the source - they are not retold by friends, or their fathers, but by the very people who experienced these terrors.