The world is always changing but the human race hasn’t. I don’t think there has ever been peace before or since history started being recorded. Humans all search for significance. Too many of them try to find it by getting power over other people. They try to get it over others of their own race and religion and also over those of a different sex, race, culture, or religion. If we were all the same color they would find another difference, like eye color, to use to discriminate.
Intelligence doesn’t solve the problem. The solution isn’t intellectual. It’s a matter of the human heart and a disrupted relationship with the Creator. Until that is fixed, there will be no lasting peace between cultures, nations, and ideologies. There is no way for me to convince someone who does not share this view and I won’t try. I do know that I have been active in churches where people of all races worked together in love and peace to accomplish their goals.