The last three emperors of the Qing Dynasty, Tongzhi, Guangxu and Puyi, did not leave any heirs.
In the palace society, if you have not heard the crying of a baby for fifty years, it will be considered the face of the subjugation of the country.
This is the same with our former vassal states, the fall of Korea.
The prerequisite for the fulfillment of the great imperial cause is undoubtedly one, that is, a sound body.
For feudal men, a sound body included the ability to conceive heirs.

The Qing emperors were weak in fertility, and the first reason of the routine was the result of the marriage of close relatives.
The Manchu nobles basically only married the Manchu nobles, so in the history of the Qing Dynasty we can see so many empresses, noble concubines and nobles. Basically, if you look at the clan tree, you can see that these people are related to each other far or near.
The second regular reason is that the living conditions are too superior and there is basically no amount of activity.
Good physical fitness is inseparable from good exercise. The Manchus were originally a nomadic people, and it was their job to go on horseback hunting. However, in the later period, the flag people were well-bred and carried at any time when they went out to walk. The emperor did not want to talk about it, go to the garden for a walk, there may be a lot of eunuchs carrying palanquins, just wait for the grandfather to be tired, you can carry it.
In such living conditions, they may not have to walk hundreds of steps every day. The amount of activity is so low that the physical fitness can be good enough to go there.
The third conventional cause lies in the ultra-high pressure living environment.
When Emperor Tongzhi died, he had only been married for two years, only 18 years old, and he had no heirs. It is said that when he died, the empress dowager of the Aluth clan already had a child in her womb, but the empress was forced to die by Cixi, and the child did not stay.
Then the Tongzhi Emperor thought that he had died too early and had not had time to give birth to a child.
Then the living environment faced by the Guangxu Emperor and Puyi has actually been in a state of high pressure. The Guangxu Emperor needless to say that going to see Cixi every day would scare him half to death.
Puyi's situation is more complicated, there is no one above him to suppress, but in the face of the unwillingness to lose the country, and cooperation with the Japanese. As a political symbol and political puppet for a long time, his heart has actually been distorted.
For three reasons, the fact that the last three generations of monarchs of the Qing Dynasty had zero births is not incomprehensible.
It's just that this zero birth is not necessarily a bad thing. The Aisin Kyora family was once a sinner of the country and the nation. It's just that this sentence is said less often.