Thanks for the explanation. Can you also explain why the children of those turkish citizens as the example that you pick, aren't considered German citizens and neither were able to get the German citizenship even after being born and growing up as adults in Germany?
Yes, there are 2 old concepts which are used by most countries.
1) Jus sanguinis (latin for blood ties or right of blood), this means u get citizenship if one of your parents is a citizen of country X.
2) Jus soli (latin for right of the soil), which means u get citizenship by the territory you are born on.
Both countries the USA and Germany nowadays have a mix of those, Germany had 1. back in the day and then introduced 2. over time, also special foreigner laws like getting a permant residency permit quiet eaily after you have been there for 8 years.
SEA especially Thailand has still only 1. so it's quiet impossible to get permant residencies till today - but fear not, you can bribe urself in paying money and its called the thai elite card -.-
I suppose you could say it goes both ways. On one hand they traditionally weren't easily accepted as a natural part of German society. On the other hand (perhaps also as a reaction towards that kind of rejection), many people with a Turkish background didn't and to some extent still don't want to become part of German society.
