Well usually, one person was going to work, and the other person usually worked at home (doing laundry, etc.) Nowadays, two people have to work to pay the mortgage. Not really progress if you ask me.
That's because we are being pushed back into the working conditions of a peasant.
They worked because there wasn't enough time to do everything. And we're being worked because we cannot get enough money for the basics, like rent and food. Its another way of control.