I don't think that race relations in the U.S. have improved as much as some/many wish to believe there have been improvements. Have relations improved in the world? I don't think so.

During the Holocaust, what happened when the Red Cross visited "camps"? A facade was presented and accepted. (Don't take my word for it. Please read: "I Never Saw Another Butterfly.")

If relations have improved, there would be no genocide, selective starvation, etc.

Just my take. I have a bi-racial or multi-cultural family. It's alarming to me when I hear some of the comments from younger relatives. I probably shouldn't get into that, however, since I'm not sure how much we may state without something being mistaken as a flame.

Great is the day when times evolve with something expressed by MLK: Judge someone not by the color of skin but by content of character (and I am paraphrasing). Bridging from what MLK stated: Character is evidenced not by when there may be witnesses but that which is done in solitude or acts no one else may ever recount. It's taking a stand and one that is right and ethical... even when no one else may be watching or be aware. (It's what each person knows that counts and makes a difference or suggests indifference.)

Can relations improve? Yessss.

But, I don't think we're there yet - worldwide, as the question asks.