As we all know, the United Kingdom consists of four parts: England, Scotland, Wales and Northern Ireland.
Scotland, Northern Ireland and Wales, all historically Celtic, are of the same root; England, on the other hand, was later the Anglo-Saxons, a bit of a dove's nest, which not only squeezed the Celts on the island of Great Britain into the mountainous hilly areas of the north and west, but also finally united (annexed) them.
Unlike Scotland and Northern Ireland, which fought against England for hundreds of years that "orcs will never be slaves", Wales has been well-behaved for hundreds of years and calmly accepted England's "arrangement".
Wales has an area of only 20,800 square kilometers and a population of more than 3 million, located in the mountainous hills west of Great Britain, very close to the core area of England, whether it is population area or geographical location, it does not have the "independent inheritance" of Northern Ireland in Scotland, and there is no difference between England for hundreds of years.
In addition, Wales' resources and industries are also scarce, and it has been dependent on England for hundreds of years, and if it is left to live alone, it is likely to have a bad life.
England also has a preference for people's livelihood education and medical care in Wales, and even the British crown prince must be named "Prince of Wales", after all, from England's point of view, there are already two disobedient ones in the north, and there is no need to make another one.
Of course, Welsh history was originally the "capitulation" of the Celts, which is essentially different from the resistance faction in Scotland.