From 1940 until about 1970, up to 4 million mothers in the United States surrendered their newborn babies to the adoption process.
I’ve copied the text below from Wikipedia
Adoption is a process whereby a person assumes the parenting for another and, in so doing, permanently transfers all rights and responsibilities, along with filiation, from the original parent or parents. Modern systems of adoption, arising in the 20th century, tend to be governed by comprehensive statutes and regulations.
Beginning in the 1940s and 1950s, illegitimacy began to be defined in terms of psychological deficits on the part of the mother. At the same time, a liberalization of sexual mores combined with restrictions on access to birth control led to an increase in premarital pregnancies. In most cases, adoption was presented to the mothers as the only option and little or no effort was made to help the mothers keep and raise the children.
All of that said, I was an extremely lucky newborn and was adopted into a loving and secure family. While I was searching through old photographs today, I found the cross stitch picture that my Mom made for us. They truly felt this way about us and we never doubted their love or loyalty.