After world war ii, the world discovered that nazi germany had murdered millions of innocent people as part of the holocaust. seeing that human beings could treat one another so horribly changed the way many people looked at war, government, and minority rights. how could these changes have impacted the study of history? a. changing the way historians interpreted past events. b. causing pre-holocaust sources to lose validity. c. preventing many people from making historical arguments. d. making historians more reliant on secondary sources.