Ok but maybe you should've named the topic that. Not to throw out definitions but I have to,
3 a: national status ; specifically : a legal relationship involving allegiance on the part of an individual and usually protection on the part of the state b: membership in a particular nation
5 a: a people having a common origin, tradition, and language and capable of forming or actually constituting a nation-state b: an ethnic group constituting one element of a larger unit
nationality - Definition from the Merriam-Webster Online Dictionary
It is your topic so it's up to you, I just don't agree with your definition. Birth is only one part of it.