The NPS has done everything it can think of to boost black attendance, and if you happen to be a young American of the African American persuasion with a reasonable education and no criminal record, the NPS would LOVE to hire you. There is a big affirmative action thumb on the scale on hiring and promotions.
The problem is cultural and that resists easy remedy. Single parent families are also a factor; mom and dad taking the kids to Yellowstone breaks down when dad is an anonymous sperm donor.
A few years back, there was an article from some SJW who claimed that blacks don’t visit National Forests because the parks are full of tree, and trees remind blacks of lynchings
And it wasn’t a satire piece
Please don't point at the elephant in the room, it makes the liberals uncomfortable.