A “nation” is a community, and without conducting a full investigation into every individual birth, the two main indicators that a child will likely have strong ties to a national community are:
the parents already belong to that national community
the parents reside permanently in the country. Almost all countries in the mid shade of blue use this criteria for restricted birthright.
A “nation” is a community, and without conducting a full investigation into every individual birth, the two main indicators that a child will likely have strong ties to a national community are: