Wow dude. You confuse a lack of opportunity with a lack of desire to participate.
The US has a huge problem with lack of opportunity. Soccer is popular all around the world because it is crazy cheap to play. You need a relatively flat field, some rocks to mark the goal and corners, and a ball. But in the US pretty much the only way to play is through leagues, and nearly every even decent player ends up on a competitive traveling team with paid coaches. The way you get into college is off these club teams, not school teams. Baseball is similar, in my city there are
multiple paid Teeball teams. They of course then destroy the rec league for everyone else as they suck up all the better kids like a vacuum at a very early age. Again, from my understanding, the kids getting into college from baseball are the ones on club teams, not the ones that only play through the schools. The days of playing in the sandlot, and then walking onto the JV team are gone.
I think basketball and football are still much more secondary school centered, so poorer kids have much more opportunity to participate at a high level.
You also then have the issue of minorities being more likely to live in denser locations without open fields, even at their schools, and you are really limiting the opportunity to participate.
There is also the issues of the best athletes will chase the best opportunities. In the US, that appears to be basketball and football for men, especially poorer men. Maybe baseball/hockey for more wealthy men. But the best male athletes in the US for the most part do not go into soccer because there are not many D1 male teams, and the pro opportunities are fewer, lower paid, and less prestigious. Big reason our national men's team sucks, in other countries the best athletes go into soccer in the US it gets or 4th or 5th string. But women in the US completely different story, tons of D1 teams, and one of the few female sports with a real pro-league, and likewise our national team is great.
Baseball has also changed in the last 20 years, now every player on the field except the catcher and pitcher are chosen for the offensive abilities (Strength, hand-eye coordination), not their defense (athleticism). By stereotypes, blacks have an advantage with pure athleticism, but now with that not weighted as highly they may have a harder time beating out the competition and the sport returns back being representative of the general population.