Comment by dofm

Literally any history of the industrial revolution in Britain (and I imagine the USA)

Farmers went from working outside at a stable work pace (and in many cases farming a small patch of their own land as part payment, so eating at least functionally well) to being forced out of their farming work by the second agricultural revolution (leading to the Swing Riots, Tolpuddle Martyrs etc.) and to living in cramped industrial slums, working in appallingly dangerous and polluted factories, long hours, terrible food, toxic chemicals, severe health issues.

Subsequent infant mortality in industrial area families was about twice the rate in industrial areas as it was in rural areas because of appalling living conditions and poor food.

It's the underpinning story of the second agricultural revolution and the industrial revolution.

An interesting link here:

https://www.nationalarchives.gov.uk/education/resources/vict...

But this is well-studied history. The industrial revolution did not liberate the poor until labour law changed to stop them being expendable; living standards took the best part of a hundred years, until as late as the early 1900s, to return to a level where people were as healthy as they were or to live as long.