Before I make my main comment, a little background information.
I have on various occasions been in a place where I was either the only white person present or where there were only a few white people. I have on several occasions visited and even resided in a black home. I had two roommates who were "people of color." I also interviewed to work with a church that if they had agreed to have me move there, I would have been one of only four white people in attendance.
There is a point which the writer did not discuss, although one might argue that one of her last comments alluded to it.
Practical integration (by which I do not mean coerced integration) will never be successful without the courage of the few who make the first steps. The color barrier in the MLB was broken down because men like Robinson and those who followed immediately after him, had the courage to go into a situation in which they were "in the minority."
One of the biggest problems with making progress in practical integration is that it is far easier to stay within one's comfort zone when one is scared that others may not accept them or that others will put on a facade of acceptance while secretly disparaging the newcomer.
Now this writer was writing about a school age child's question — and I am opposed to treating children as pawns in the games of adults. But it is vitally necessary that if we ever want to overcome the aftereffects of the past that adults have the courage to step out of their comfort zones.
We can eliminate all the Jim Crow laws we want and we can make things like red-lining illegal but until we as individuals are prepared to intermingle our lives, the barriers will remain. Some people even use the word "diversity" as a wall to preserve invisible walls.
England once was primarily Saxons, Anglos, and Scandinavians. Then the Normans invaded. The Normans erected cultural walls and referred to the customs and languages of the other peoples as "vulgar" because they could not be traced back to the latin. Further, the Normans tried to create a myth of England as the new romans. (This is why the KJV uses latin names for greek places and idols and why Homer's works published in the UK have been published with Latin names.) Over the course of many centuries, the walls separting the Normans from the rest of England eventually began to erode, but there were traditionalists who tried to preserve the Norman identity for as long as possible.
Let's not be like them. It doesn't matter where my ancestors may have come from. I have no interest in preserving their culture nor in glorifying their memory. Let us together make a new culture and let it not be based in the accident of birth and ancestry. Courage!