You may enjoy The Invisible Line by Daniel Sharfstein. He maintains that all races mixed freely for 250 years over here without racial prejudice and hatred. That is, the inhumanity of slavery and the conquest of native land were facts, but among free people, there were no barriers as to color. Children born of free mothers were free without prejudice. And there were many freed slaves from the very beginning. They intermarried and became leaders in their communities and all people defended them and their offspring as free since their kind were an integral part of most communities. Like Colbert says, those people did not see color. Slave status, yes.
The pie hit the fan after the Civil War and the eventual reaction by the South to the Radical Reconstruction. Like the Germans who went into Hitler's arm after the war-guilt and reparations of WWI, the Southerns reversed the historical traditions and defined race as a 'single drop of blood'. Suddenly mixed people were forced to move to new areas and hide their ancestry. Soon the knowledge of one's past became lost (except those with native blood who kept that knowledge alive with pride). Even Obama's mother, it turns out, may have had black blood in her past. Chances are we may all. In other words, the horrors of racial hatred that mark the last 150 years are an aberration from our longer past. We could have been a racially open society along the lines of a Portugal. Damn Booth's bullet.