Zuckerberg's bio on Wikipedia says that he is the son of a dentist and a psychiatrist. I'm sure there are plenty of Americans with wealthier or more connected families, and none of them have succeeded with their startup the way he has.
I'm sure there are plenty of Americans with wealthier or more connected families
Sure, but only about 5%. The median salary for a dentist and a psychiatrist adds up to $333,000 which is the 95% percentile for household income today. A verrry long way from average.