I used to be involved with Bikes not Bombs in Boston(https://bikesnotbombs.org/). Now that I’m in the Deep South, our town has a program called Village Wrench (http://www.villagewrench.org/). If you don’t have something similar in your town, START ONE NOW.
Getting kids into bicycles is the best in terms of doing something meaningful and long-lasting. But take a look at NICA – how many black kids are in the program? There’s no barrier to racial inclusivity, yet the program is largely made of white kids. I think culture and money are the factors in play.
I ride often with Colombians. They’re fast as hell, very good mountain bikers. But cycling is in their culture, and coming up with a few grand for a bike isn’t a killer proposition for them. Hard, but doable.
Look at that VillageWrench website. My opinion, that’s the way to start something lasting.