This is science. If you look at the history textbooks of different countries and historical periods, you will find that many statements are different. Which ones are true and which ones are false? This needs to be studied. There is a saying that "history is a little girl who can dress up", which is true in all countries. What you should believe and what you should let others know are all very learned. You don't know how to judge until you see more. For example, if you read American books, you will feel that only America is good in the world. This is an example.