Well, in both you can adopt children from the care system at no cost but with a lot of assessment. In the US you can also adopt privately - prospective parents find a pregnant woman who wants to relinquished the baby and pay her "expenses". The film 'Juno' features this kind of adoption. There are far fewer checks.
Whatever, parenting a biologically unrelated child is not necessarily straightforward. Babies removed at birth can suffer from the separation from birth mother - this is known as the 'primal wound' and it can have ongoing implications.
Also, the birth mother may have taken drugs, alcohol, have been highly stressed. The baby may have many additional needs.
Adoption is often very challenging, though rewarding. But for a 21 year old to sign up for it is remarkable.