Rubbish. Do you own a passport? The last 3 sports are all a bit elitist, in that you pretty much need to be raised in a 1st world country, often needing wealthy parents to just participate. Hence there ain't no black African track cyclists, OIympic rowers or snowboarders. Rugby less so.
Football is the true world game, that can be played anywhere from a dusty street with rags rolled into a ball, to Old Trafford. Of course your population is a major factor, in how deep your player pool will be. But yes not the only factor as the likes of Uruguay, Iceland, Croatia have shown now & again.
Nigeria has a population of 224M. If even 0.01% of them played competitive football, that's still likely greater than the number of registered footballers in NZ. It's no surprise they are a team quickly on the rise in the Women's game.
I've spent a few months in Colombia at various times the last 5 odd years. They are football mad & there are 50M of them. There will be thousands of young fiesty girls now running around the barrios knocking over boys trying to be the next Linda Caicedo. Power to them.