None of the original citizens were natural born, however, they understood what would happen if they granted citizenship to everyone born in the United States, regardless of whether their parents were citizens or not. This was one of the basic fundamentals of immigration once it was apparent so many immigrants wanted to be an American. That is why citizenship is earned, and not granted. They were very protective of the sacred right to vote, as well. You not only had to be a citizen, but a landowner, as well. That was to show you had skin in the game, so to speak.

It was understood back in that day that in order to be born with citizenship, at least one parent had to already be a citizen. Had that not been the case, there would have been no need to protect the borders, nor for Ellis island. What would have been the point?