From the perspective of world history, human society has gone through several stages, from primitive society to slave society, feudal society, to capitalist society, and then to socialist society. Each stage has the characteristics and reasons of each stage, and from the perspective of each stage, basically the next stage will leave the imprint of the previous stage, which is the main reason why so many capitalist countries have retained the royal family and kings of the feudal dynasty. So most countries in the West have kings, and what they can't figure out is why China has eliminated the royal family? The reason is mainly three points.

In the history of the world's major countries, many countries have gone through a long era of feudal dynasties, and the royal family and kings have become the masters of the country. And they have all undergone continuous dynastic changes, of which the country with the longest feudal era is China. China has thousands of years of feudal history and dozens of dynasties, so in the world, China's feudal system is deeply rooted.
According to modern historical experience, basically the longer the feudal era, and the deeper the feudal era, basically retain the royal family. This is also the main reason why so many countries in the world have retained their royal families. The most typical is Europe, many countries have royal families, such as Britain, Spain, Norway and so on.
In addition, in the Middle East, a large number of royal families have also been preserved, such as Saudi Arabia, the United Arab Emirates, Qatar, etc. There are also Africa, South America, and even Oceania, etc., there are also many royal families. What the West still can't understand is that China, as the longest feudal era, has completely eliminated the royal family and the feudal system, so the West still can't figure it out, why did china eliminate the royal family? In fact, the reasons are mainly three points.
First, the decay of feudal dynasties.
It is precisely because of the feudal era of thousands of years in ancient China that the dross and darkness of the feudal era are deeply rooted. Especially at the end of the Qing Dynasty, the decay and darkness of the feudal system embodied in it made Chinese hate the feudal system and the hatred of the royal family.
In particular, the Qing Dynasty refused to reform, refused to keep up with the trend of the times, constantly decayed, and constantly betrayed the country, which undoubtedly hurt the feelings of the people the most. Therefore, especially after the failure of the Penghu Reform Law, as well as the entire Eight-Power Alliance invaded China, as well as the traitorous acts of the entire Qing Dynasty royal family, the royal family lost its legitimacy in China, which is the most core reason for the disappearance of the royal family in the end.
Second, the representation of nationalities.
For the royal family of each country, it is representative of the nation, or the representative of culture, otherwise it cannot play a role of representation and model. The royal family of the Qing Dynasty, only as the Ai XinJue Luo family, and represented the Manchus, did not have the representative of the whole people. Moreover, its representativeness is not as good as that of Confucius's descendants, or ancient dynasties such as the Han Dynasty, Tang Dynasty, and even the descendants of the Ming Dynasty, so there is no way to maintain it.
Third, the revolution was overthrown.
The revolution in our country is the use of force to completely overthrow the old dynasty and create a new system, so this is very thorough and perfect in the world. This point is undoubtedly the core, with the revolution, the entire royal family is difficult to continue, the entire foundation and the basis of rule are completely eliminated, which makes our country no longer have the soil to retain the royal family. It is worth mentioning that the revolution in our country is relatively moderate, and it has not completely eliminated the royal family like Russia, and directly killed the royal family.
The royal family of our country has only lost its power, and what is more important is that Puyi, the last emperor of our country, not only defected to Japan in modern times, but also had no heirs and no heirs, so this also made it difficult to continue. Therefore, even though our country has the longest feudal era in the world, it is now the country that has completely eliminated the royal family.
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Reference: Modern and Contemporary Chinese History.