In 1980s Rwanda, the Hutu and Tutsi tribes lived together peacefully. They intermarried and were neighbors.
It wasn't until hateful political and racial propaganda was openly spread that the two tribes (who had some distinguishing attributes) began to treat each other differently. Mainly, the Hutus spread hate about the minority Tutsis who largely held a leadership role in Rwanda.
The tensions led to the eventual genocide of nearly a million Tutsis. If you'd like to know more, please read about the story of Immaculée Ilibagiza and her account of hiding in a tiny room for months while groups of Hutus killed nearly all of her family (only a brother studying out of the country survived).
The hateful propaganda of today's American left reminds me of the hateful, divisive propaganda of Hutu media that weaponized one race over the other for mostly political reasons. It seems as though America's left will do anything for political power and the lessons of Rwanda fall flat ...