Oh, please. A hundred years ago you wouldn't even have been able to get people of different skin colors to cooperate. We're doing better on that front than we ever have.
Don't confuse the problems of a decade for the problems of an era.
On that front. Blacks and whites used to trust their fellow blacks and whites much more than we trust each other now. It's easier to trust people like you when there are people not like you. Don't forget that the solutions for one era can cause the problems of the next.
EDIT: And before anyone says it, no I'm not advocating a return to segregation or for racial genetics.
One "solution" to the US's racially charged past was not to ever mention anyone's skin color or race because that might be "rude". That ends up causing more problems than it solves, IMO. Sort of like replacing hand towels with those stupid blowdryers.