You know, throughout the world, throughout history, when countries get rich, they stop having kids.

If you have waves of immigration, you better figure out a way to turn those immigrants into red-blooded Americans, or else you end up splintering the society.

You need somebody to support the retirees. You need to pay into the pension plans. You need people to work at the hospitals, at the nursing homes.

When Teddy Roosevelt was around, there was an Ottoman Empire. There was a Habsburg empire. They controlled millions of people across Africa, the Middle East and Europe. And they're gone.Prosperity killed them, because they didn't have a way to hold the people together. They didn't have the rituals and the holidays and the pride in their country. And that's what we need if we're going to hold ourselves together during periods of prosperity.

Rich countries don't need as many children. We used to need kids to work in the fields as farm hands, to crawl on their bellies into coal mines. Well, kids are more like luxury objects now.

It's a good thing we have immigrant doctors and immigrant engineers, because if you or I get sick this afternoon, we're going to go to the hospital, and we're going to hope someone serves us.

We're prosperous enough that we can afford to have one in six able-bodied men of working age sitting at home playing video games.