History is always written by the winners. Native Americans know it, African Americans know it, Latinos know it, working class people in every country in this world know it, every union member who has ever lived knows it. Everyone who has ever been beaten into submission by the power of armies, by the power of economic might, by the power of entrenched conservatism, entrenched conformity, and entrenched bigotry knows it.
When two cultures or belief systems clash, the loser is slandered and condemned by the winner, who writes the history books, books which glorify their culture or belief system and sanctify it as inherently superior. The truth is ignored. As Napoleon once said, “What is history, but a fable agreed upon?”