the answer is 1000 years of Christianity, rule of law and vitally about 3 cm worth of genetic drift between the three of them
Exactly. Though it's not about genetics. It's the politics of people, about how/where they are raised. The fact that people can chose their own politics means they can chose their own nation.
If a white brit suddenly converts to Islam and does some jihad are they still part of your christian nation? No. They would still be a brit though (nation != country).
What nation do Afrikaners belong to? Genetically they are of european descent, but today they are a different nation because they were raised elsewhere in a different culture. (Nations != genetics)
You're conflating nations with genetic groups.
Exactly. Though it's not about genetics. It's the politics of people, about how/where they are raised. The fact that people can chose their own politics means they can chose their own nation.
If a white brit suddenly converts to Islam and does some jihad are they still part of your christian nation? No. They would still be a brit though (nation != country).
What nation do Afrikaners belong to? Genetically they are of european descent, but today they are a different nation because they were raised elsewhere in a different culture. (Nations != genetics)