[Thorrez]

In the 1800s they had 6-8 people living in a single room in NYC, with no windows and no plumbing.[1]

My grandma (still alive today) grew up in the US without plumbing. She had to use an outhouse.

There's an inverse relationship between wealth and fertility. Wealthy countries are less fertile than poor countries. Within wealthy countries the wealthier people are less fertile than the poorer people.[2]

[1] https://youtu.be/RL7BECNn-RI?t=151

[2] https://en.wikipedia.org/wiki/Income_and_fertility