The page reads like a revision course in listing the pro's and cons of each status but I have to say, the maps are striking in that they illustrate well the fact long established countries, such as in Europe, tend to be jus sanguinis, whereas newer countries, such as the USA, and Canada (both of which used to be British or French and even Dutch at some point in some part) tend to be by jus soli, probably because of the sheer recency of much of its population and huge waves of immigration during the early 1990's to 40's thanks to wars and economic upheavals. Pakistan, too, formed as a result of the bloody partition from India in 1948, meant that many Indians practising the Islam religion had to displace to the Muslim side and vice-versa. Countries that were old British empires had to allow for colonising Brits to be able to claim British nationality, even if their kin had not lived there for two or three generations. But then came the problem of keeping out those seen as 'natives' (sorry about the offensive word, can't think of a better one) so nationality law became very complex in countries such as Great Britain, France, Netherlands, Germany, Italy; just about any country that colonised other countries.
So, taking for example, persons in the public eye, British cabinet minister, Kemi Badenoch, whose both parents were Nigerian nationals, was able to claim British citizenship because Nigeria was once a British Protectorate with lots of British ruling class incomers having kids born there, so thus, there had to be a legal mechanism to allow those kids full British citizenship. However, as the law cannot be seen to be based on personal characteristics, such as 'race' (not in the UK, anyway), the way to get around the 'unwanted immigrants problem' was to date set it so it only applied to people born before, say, 1971, once Britain was no longer a colonising force in its former territories. But as Kemi's parents (one or the other, or both) had worked in the NHS in England during a relevant period and Kemi was born during that time - some say her mother made a point of making sure Kemi was UK born, [and why not, if that's the way the law works?]) - then Kemi had a right to full UK citizenship without having to jump through hoops. This process also worked for several other government ministers, whose parents were born in places such as India, Kenya, or wherever there were former British territories. The British Nationality laws have became far more complicated than jus sanguinis or jus soli. Rishi Sunak's parents were not even born in India but are only Indian by ethnicity via grandparents, strictly speaking they were second or third generation East Africans.
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