Why did the economy change that we need 2 full-time breadwinners as opposed to 1 less than a decade ago?

Question

Edit: I meant less than a century ago! My bad! Just a brain fart.

In: 9783

Answer 1

It’s only a small period of time where there weren’t two incomes in households. There may have been a male breadwinner as the main income but the wife almost always had some sort of income as well. Only richer families lived with sole breadwinners throughout history.