Bark, not only do you know very little about pre-1980 history; you also know very little about the rest of the world today.
Do you really believe that poor rural mothers in Africa and Asia can afford to sit at home looking after their children all day without contributing to the economy?
Are you not aware that in many parts of Africa it is women who do pretty well all the work on the land?
That it is very common for women to leave their village (leaving their children in charge of relatives) to seek for work in the towns?
That the whole maid system in the Middle East rests on women who have left their own countries, and often their own children, behind top find work?
That an awful lot of the everyday products we use- clothing, shoes, handbags etc- are produced by mothers in China, India and Pakistan who take on this work to support their families?
The situation, in other words, is very similar to what it was in the west in the pre-war period: in poor families, child-minding will be done by anybody who is not able to contribute financially by growing crops, minding animals or bringing in a wage: aged grandparents, older siblings, the ill and the infirm. Able-bodied people are needed to bring in money.
oh, and btw childminders did exist before the 1980's.