Well, let's say that in the United States it's often called the "Black National Anthem." A couple of years ago, I was at a church gathering where Dr. Kim Harris (formerly of Kim & Reggie) sang this with 10,000 people. But they were white Catholics, and didn't know the song. I sang con mucho gusto, and I really enjoyed the performance.
There's a very interesting Wikipedia article on the song:

https://en.wikipedia.org/wiki/Lift_Every_Voice_and_Sing