15 percent of males in the US are six feet and taller and almost 80 percent of them are white. Also Asians and Hispanics significantly cause the lower average male height in the USA because the majority of both are 5'7 and shorter. Also ironically is the current white males are shorter than previous generations likely due to their mother's height be a major factor. If a 6'3 dude breeds a 5'2 women the odds of their sons being six feet tall are basically zero.