Do you think the population of the US is all from immigration and rich people?

(A relative worked out our family tree. Lots of families with 8 kids in them.)

What amuses me is that once you’ve worked out the function to have a kid, it’s easy to have another.

In theory there should be tons of childless people and some balancing number of 10+ kid families. Then the average numbers work out, everyone is from a large family, but the means of production are centralized and efficient.