I believe that under common law, the citizenship of the Dad is historically the only one that mattered.
We have both a 14th Amendment now, and various Acts of Congress.
Here’s an example to back up your statement:
On my Mom’s side, both of her parents came from Italy. My grandfather became a US citizen before my Mom was born (in the USA), my Grandmother was not a US citizen at the time.
Italy will not grant my Mom citizenship because her father was a US citizen when she was born. They could care less that her mother wasn’t a US citizen (which she became later); it’s all about the Father.
http://www.birthers.org/misc/logic.htm
Natural born for dummies. Not making any assumptions about you.
It doesn’t matter whether the kid’s parents were married or not.
The Constitution refers to birth parents.
There are hundreds of thousands of NBCs in the US because both parents were US citizens and the kids were born in the US. That’s why so many baby mamas don’t marry. They get more welfare money from taxpayers for every kid they hatch.