“I didn’t know there was a “black” national anthem.”
There isn’t. The ‘Star-Spangled Banner’ didn’t become the U.S. national anthem until March 3, 1931. On this day in 1931, President Herbert Hoover signed the bill designating “The Star-Spangled Banner” as the official national anthem of the United States. No such bill of any other anthem for the US has been recognized or signed into being. They can play what ever it is all they want unless the facility they are using says no. That is private property. But as a retail product, they will also have to reap the backlash of public opinion even for only 2 games.
This is what can happen, and I hope it does:
https://www.fresnobee.com/sports/high-school/article211991974.html
rwood