Repopulation Postcards : CABBAGE PATCH KIDS / 1800s Cloning / Babylon Babies

I always here from older gen xers and boomers how a lot of their great grandparents from the 1900s were adopted and don't remember where they came from, they just went on a train and moved to certain cities some celebrities from the older crowd like jerry Seinfeld said both his parents were adopted you get that story a lot from people's great grandparents what was really going on back then? Were these clones being spread out threw the masses while men were being sent out to be slaughtered in world wars to repopulate areas with clones?