And if the 1790 act chose to give a description of what a NBC was and subsequent acts never chose to rescind that definition I will go with the precedent.
The 1790 act did not give a description of what a Natural Born Citizen was. It simply said that those born in Foreign countries to an American Father would be "considered as natural born citizens. "
It means Adopted Children would be treated as if they were blood offspring. It doesn't mean that they were.