Bad and good are relative, and there is never absolute justice and evil, so anyone can be the worst person in history.

In my opinion:

1, the tsar was the worst one, and took away four or five million square kilometers of the northern territory of our country.

2. The little Japanese emperor is the worst one. He actually engaged in the "Nanjing Massacre" and the "Three Lights Policy".

Stalin is also a bad man, he carved up all the outer Mongolia of our country.

4. Hitler was not good either, and many people were sent to heaven by him. But he is still infatuated with China people.