This has a more to do with economics than anything. I have mostly white friends that are professionals, either Doctors or Lawyers. Most of them only have one child, two at most because that is all they can reasonably provide for. However I went to a public high school and many of my lower socioeconomic classmates there were minorities, and they had multiple children before they were 25. Gone are the days of total financial independence and responsibility in your 20's and families with 4 or 5 children, it is just not economically feasible now days.
Delicious Tacos is the voice of my generation....